diff --git a/.travis.yml b/.travis.yml
index e4a1e5ca5..0c8ad12bd 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -52,3 +52,8 @@ jobs:
       env: STATIC_ANALYSIS
       install: travis_retry composer install --prefer-dist
       script: vendor/bin/psalm
+
+    - stage: Backwards Compatibility
+      env: STATIC_ANALYSIS
+      install: travis_retry composer install --prefer-dist
+      script: vendor/bin/roave-backward-compatibility-check --from=v1.5.0
diff --git a/composer.json b/composer.json
index 828a7d2f0..ead7d41c0 100644
--- a/composer.json
+++ b/composer.json
@@ -24,6 +24,7 @@
         "phpunit/phpunit": "^7.0",
         "doctrine/coding-standard": "^6.0",
         "phpstan/phpstan-shim": "^0.9.2",
+        "roave/backward-compatibility-check": "^2.1.0",
         "vimeo/psalm": "^3.2.2"
     },
     "autoload": {
diff --git a/composer.lock b/composer.lock
index 27e6bbaf6..8c0ec92e3 100644
--- a/composer.lock
+++ b/composer.lock
@@ -4,7 +4,7 @@
         "Read more about it at https://getcomposer.org/doc/01-basic-usage.md#installing-dependencies",
         "This file is @generated automatically"
     ],
-    "content-hash": "9089934b1d5718afcff78cb110ec244a",
+    "content-hash": "c0bc60534cd3fb6e1daabfdbee1956c2",
     "packages": [],
     "packages-dev": [
         {
@@ -142,6 +142,320 @@
             ],
             "time": "2018-12-27T18:08:06+00:00"
         },
+        {
+            "name": "beberlei/assert",
+            "version": "v2.9.6",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/beberlei/assert.git",
+                "reference": "ec9e4cf0b63890edce844ee3922e2b95a526e936"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/beberlei/assert/zipball/ec9e4cf0b63890edce844ee3922e2b95a526e936",
+                "reference": "ec9e4cf0b63890edce844ee3922e2b95a526e936",
+                "shasum": ""
+            },
+            "require": {
+                "ext-mbstring": "*",
+                "php": ">=5.3"
+            },
+            "require-dev": {
+                "friendsofphp/php-cs-fixer": "^2.1.1",
+                "phpunit/phpunit": "^4.8.35|^5.7"
+            },
+            "type": "library",
+            "autoload": {
+                "psr-4": {
+                    "Assert\\": "lib/Assert"
+                },
+                "files": [
+                    "lib/Assert/functions.php"
+                ]
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "BSD-2-Clause"
+            ],
+            "authors": [
+                {
+                    "name": "Benjamin Eberlei",
+                    "email": "kontakt@beberlei.de",
+                    "role": "Lead Developer"
+                },
+                {
+                    "name": "Richard Quadling",
+                    "email": "rquadling@gmail.com",
+                    "role": "Collaborator"
+                }
+            ],
+            "description": "Thin assertion library for input validation in business models.",
+            "keywords": [
+                "assert",
+                "assertion",
+                "validation"
+            ],
+            "time": "2018-06-11T17:15:25+00:00"
+        },
+        {
+            "name": "composer/ca-bundle",
+            "version": "1.1.4",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/composer/ca-bundle.git",
+                "reference": "558f321c52faeb4828c03e7dc0cfe39a09e09a2d"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/composer/ca-bundle/zipball/558f321c52faeb4828c03e7dc0cfe39a09e09a2d",
+                "reference": "558f321c52faeb4828c03e7dc0cfe39a09e09a2d",
+                "shasum": ""
+            },
+            "require": {
+                "ext-openssl": "*",
+                "ext-pcre": "*",
+                "php": "^5.3.2 || ^7.0"
+            },
+            "require-dev": {
+                "phpunit/phpunit": "^4.8.35 || ^5.7 || ^6.5",
+                "psr/log": "^1.0",
+                "symfony/process": "^2.5 || ^3.0 || ^4.0"
+            },
+            "type": "library",
+            "extra": {
+                "branch-alias": {
+                    "dev-master": "1.x-dev"
+                }
+            },
+            "autoload": {
+                "psr-4": {
+                    "Composer\\CaBundle\\": "src"
+                }
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "MIT"
+            ],
+            "authors": [
+                {
+                    "name": "Jordi Boggiano",
+                    "email": "j.boggiano@seld.be",
+                    "homepage": "http://seld.be"
+                }
+            ],
+            "description": "Lets you find a path to the system CA bundle, and includes a fallback to the Mozilla CA bundle.",
+            "keywords": [
+                "cabundle",
+                "cacert",
+                "certificate",
+                "ssl",
+                "tls"
+            ],
+            "time": "2019-01-28T09:30:10+00:00"
+        },
+        {
+            "name": "composer/composer",
+            "version": "1.8.4",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/composer/composer.git",
+                "reference": "bc364c2480c17941e2135cfc568fa41794392534"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/composer/composer/zipball/bc364c2480c17941e2135cfc568fa41794392534",
+                "reference": "bc364c2480c17941e2135cfc568fa41794392534",
+                "shasum": ""
+            },
+            "require": {
+                "composer/ca-bundle": "^1.0",
+                "composer/semver": "^1.0",
+                "composer/spdx-licenses": "^1.2",
+                "composer/xdebug-handler": "^1.1",
+                "justinrainbow/json-schema": "^3.0 || ^4.0 || ^5.0",
+                "php": "^5.3.2 || ^7.0",
+                "psr/log": "^1.0",
+                "seld/jsonlint": "^1.4",
+                "seld/phar-utils": "^1.0",
+                "symfony/console": "^2.7 || ^3.0 || ^4.0",
+                "symfony/filesystem": "^2.7 || ^3.0 || ^4.0",
+                "symfony/finder": "^2.7 || ^3.0 || ^4.0",
+                "symfony/process": "^2.7 || ^3.0 || ^4.0"
+            },
+            "conflict": {
+                "symfony/console": "2.8.38"
+            },
+            "require-dev": {
+                "phpunit/phpunit": "^4.8.35 || ^5.7",
+                "phpunit/phpunit-mock-objects": "^2.3 || ^3.0"
+            },
+            "suggest": {
+                "ext-openssl": "Enabling the openssl extension allows you to access https URLs for repositories and packages",
+                "ext-zip": "Enabling the zip extension allows you to unzip archives",
+                "ext-zlib": "Allow gzip compression of HTTP requests"
+            },
+            "bin": [
+                "bin/composer"
+            ],
+            "type": "library",
+            "extra": {
+                "branch-alias": {
+                    "dev-master": "1.8-dev"
+                }
+            },
+            "autoload": {
+                "psr-4": {
+                    "Composer\\": "src/Composer"
+                }
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "MIT"
+            ],
+            "authors": [
+                {
+                    "name": "Nils Adermann",
+                    "email": "naderman@naderman.de",
+                    "homepage": "http://www.naderman.de"
+                },
+                {
+                    "name": "Jordi Boggiano",
+                    "email": "j.boggiano@seld.be",
+                    "homepage": "http://seld.be"
+                }
+            ],
+            "description": "Composer helps you declare, manage and install dependencies of PHP projects, ensuring you have the right stack everywhere.",
+            "homepage": "https://getcomposer.org/",
+            "keywords": [
+                "autoload",
+                "dependency",
+                "package"
+            ],
+            "time": "2019-02-11T09:52:10+00:00"
+        },
+        {
+            "name": "composer/semver",
+            "version": "1.5.0",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/composer/semver.git",
+                "reference": "46d9139568ccb8d9e7cdd4539cab7347568a5e2e"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/composer/semver/zipball/46d9139568ccb8d9e7cdd4539cab7347568a5e2e",
+                "reference": "46d9139568ccb8d9e7cdd4539cab7347568a5e2e",
+                "shasum": ""
+            },
+            "require": {
+                "php": "^5.3.2 || ^7.0"
+            },
+            "require-dev": {
+                "phpunit/phpunit": "^4.5 || ^5.0.5",
+                "phpunit/phpunit-mock-objects": "2.3.0 || ^3.0"
+            },
+            "type": "library",
+            "extra": {
+                "branch-alias": {
+                    "dev-master": "1.x-dev"
+                }
+            },
+            "autoload": {
+                "psr-4": {
+                    "Composer\\Semver\\": "src"
+                }
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "MIT"
+            ],
+            "authors": [
+                {
+                    "name": "Nils Adermann",
+                    "email": "naderman@naderman.de",
+                    "homepage": "http://www.naderman.de"
+                },
+                {
+                    "name": "Jordi Boggiano",
+                    "email": "j.boggiano@seld.be",
+                    "homepage": "http://seld.be"
+                },
+                {
+                    "name": "Rob Bast",
+                    "email": "rob.bast@gmail.com",
+                    "homepage": "http://robbast.nl"
+                }
+            ],
+            "description": "Semver library that offers utilities, version constraint parsing and validation.",
+            "keywords": [
+                "semantic",
+                "semver",
+                "validation",
+                "versioning"
+            ],
+            "time": "2019-03-19T17:25:45+00:00"
+        },
+        {
+            "name": "composer/spdx-licenses",
+            "version": "1.5.0",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/composer/spdx-licenses.git",
+                "reference": "7a9556b22bd9d4df7cad89876b00af58ef20d3a2"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/composer/spdx-licenses/zipball/7a9556b22bd9d4df7cad89876b00af58ef20d3a2",
+                "reference": "7a9556b22bd9d4df7cad89876b00af58ef20d3a2",
+                "shasum": ""
+            },
+            "require": {
+                "php": "^5.3.2 || ^7.0"
+            },
+            "require-dev": {
+                "phpunit/phpunit": "^4.8.35 || ^5.7 || ^6.5",
+                "phpunit/phpunit-mock-objects": "2.3.0 || ^3.0"
+            },
+            "type": "library",
+            "extra": {
+                "branch-alias": {
+                    "dev-master": "1.x-dev"
+                }
+            },
+            "autoload": {
+                "psr-4": {
+                    "Composer\\Spdx\\": "src"
+                }
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "MIT"
+            ],
+            "authors": [
+                {
+                    "name": "Nils Adermann",
+                    "email": "naderman@naderman.de",
+                    "homepage": "http://www.naderman.de"
+                },
+                {
+                    "name": "Jordi Boggiano",
+                    "email": "j.boggiano@seld.be",
+                    "homepage": "http://seld.be"
+                },
+                {
+                    "name": "Rob Bast",
+                    "email": "rob.bast@gmail.com",
+                    "homepage": "http://robbast.nl"
+                }
+            ],
+            "description": "SPDX licenses list and validation library.",
+            "keywords": [
+                "license",
+                "spdx",
+                "validator"
+            ],
+            "time": "2018-11-01T09:45:54+00:00"
+        },
         {
             "name": "composer/xdebug-handler",
             "version": "1.3.2",
@@ -315,27 +629,29 @@
         },
         {
             "name": "doctrine/instantiator",
-            "version": "1.1.0",
+            "version": "1.2.0",
             "source": {
                 "type": "git",
                 "url": "https://github.com/doctrine/instantiator.git",
-                "reference": "185b8868aa9bf7159f5f953ed5afb2d7fcdc3bda"
+                "reference": "a2c590166b2133a4633738648b6b064edae0814a"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/doctrine/instantiator/zipball/185b8868aa9bf7159f5f953ed5afb2d7fcdc3bda",
-                "reference": "185b8868aa9bf7159f5f953ed5afb2d7fcdc3bda",
+                "url": "https://api.github.com/repos/doctrine/instantiator/zipball/a2c590166b2133a4633738648b6b064edae0814a",
+                "reference": "a2c590166b2133a4633738648b6b064edae0814a",
                 "shasum": ""
             },
             "require": {
                 "php": "^7.1"
             },
             "require-dev": {
-                "athletic/athletic": "~0.1.8",
+                "doctrine/coding-standard": "^6.0",
                 "ext-pdo": "*",
                 "ext-phar": "*",
-                "phpunit/phpunit": "^6.2.3",
-                "squizlabs/php_codesniffer": "^3.0.2"
+                "phpbench/phpbench": "^0.13",
+                "phpstan/phpstan-phpunit": "^0.11",
+                "phpstan/phpstan-shim": "^0.11",
+                "phpunit/phpunit": "^7.0"
             },
             "type": "library",
             "extra": {
@@ -360,12 +676,12 @@
                 }
             ],
             "description": "A small, lightweight utility to instantiate objects in PHP without invoking their constructors",
-            "homepage": "https://github.com/doctrine/instantiator",
+            "homepage": "https://www.doctrine-project.org/projects/instantiator.html",
             "keywords": [
                 "constructor",
                 "instantiate"
             ],
-            "time": "2017-07-22T11:58:36+00:00"
+            "time": "2019-03-17T17:37:11+00:00"
         },
         {
             "name": "felixfbecker/advanced-json-rpc",
@@ -455,6 +771,72 @@
             ],
             "time": "2018-09-25T11:42:25+00:00"
         },
+        {
+            "name": "justinrainbow/json-schema",
+            "version": "5.2.8",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/justinrainbow/json-schema.git",
+                "reference": "dcb6e1006bb5fd1e392b4daa68932880f37550d4"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/justinrainbow/json-schema/zipball/dcb6e1006bb5fd1e392b4daa68932880f37550d4",
+                "reference": "dcb6e1006bb5fd1e392b4daa68932880f37550d4",
+                "shasum": ""
+            },
+            "require": {
+                "php": ">=5.3.3"
+            },
+            "require-dev": {
+                "friendsofphp/php-cs-fixer": "~2.2.20",
+                "json-schema/json-schema-test-suite": "1.2.0",
+                "phpunit/phpunit": "^4.8.35"
+            },
+            "bin": [
+                "bin/validate-json"
+            ],
+            "type": "library",
+            "extra": {
+                "branch-alias": {
+                    "dev-master": "5.0.x-dev"
+                }
+            },
+            "autoload": {
+                "psr-4": {
+                    "JsonSchema\\": "src/JsonSchema/"
+                }
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "MIT"
+            ],
+            "authors": [
+                {
+                    "name": "Bruno Prieto Reis",
+                    "email": "bruno.p.reis@gmail.com"
+                },
+                {
+                    "name": "Justin Rainbow",
+                    "email": "justin.rainbow@gmail.com"
+                },
+                {
+                    "name": "Igor Wiedler",
+                    "email": "igor@wiedler.ch"
+                },
+                {
+                    "name": "Robert Schönthal",
+                    "email": "seroscho@googlemail.com"
+                }
+            ],
+            "description": "A library to validate a json schema.",
+            "homepage": "https://github.com/justinrainbow/json-schema",
+            "keywords": [
+                "json",
+                "schema"
+            ],
+            "time": "2019-01-14T23:55:14+00:00"
+        },
         {
             "name": "muglug/package-versions-56",
             "version": "1.2.4",
@@ -513,25 +895,28 @@
         },
         {
             "name": "myclabs/deep-copy",
-            "version": "1.7.0",
+            "version": "1.8.1",
             "source": {
                 "type": "git",
                 "url": "https://github.com/myclabs/DeepCopy.git",
-                "reference": "3b8a3a99ba1f6a3952ac2747d989303cbd6b7a3e"
+                "reference": "3e01bdad3e18354c3dce54466b7fbe33a9f9f7f8"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/myclabs/DeepCopy/zipball/3b8a3a99ba1f6a3952ac2747d989303cbd6b7a3e",
-                "reference": "3b8a3a99ba1f6a3952ac2747d989303cbd6b7a3e",
+                "url": "https://api.github.com/repos/myclabs/DeepCopy/zipball/3e01bdad3e18354c3dce54466b7fbe33a9f9f7f8",
+                "reference": "3e01bdad3e18354c3dce54466b7fbe33a9f9f7f8",
                 "shasum": ""
             },
             "require": {
-                "php": "^5.6 || ^7.0"
+                "php": "^7.1"
+            },
+            "replace": {
+                "myclabs/deep-copy": "self.version"
             },
             "require-dev": {
                 "doctrine/collections": "^1.0",
                 "doctrine/common": "^2.6",
-                "phpunit/phpunit": "^4.1"
+                "phpunit/phpunit": "^7.1"
             },
             "type": "library",
             "autoload": {
@@ -554,7 +939,7 @@
                 "object",
                 "object graph"
             ],
-            "time": "2017-10-19T19:58:43+00:00"
+            "time": "2018-06-11T23:09:50+00:00"
         },
         {
             "name": "netresearch/jsonmapper",
@@ -649,6 +1034,59 @@
             ],
             "time": "2019-02-16T20:54:15+00:00"
         },
+        {
+            "name": "nikolaposa/version",
+            "version": "3.1.0",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/nikolaposa/version.git",
+                "reference": "cf87d80a4848db3092e65029a4ff29a712357fbf"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/nikolaposa/version/zipball/cf87d80a4848db3092e65029a4ff29a712357fbf",
+                "reference": "cf87d80a4848db3092e65029a4ff29a712357fbf",
+                "shasum": ""
+            },
+            "require": {
+                "php": "^7.2.0"
+            },
+            "require-dev": {
+                "friendsofphp/php-cs-fixer": "^2.0",
+                "phpunit/phpunit": "^6.0 || ^7.0"
+            },
+            "type": "library",
+            "extra": {
+                "branch-alias": {
+                    "dev-master": "3.1.x-dev"
+                }
+            },
+            "autoload": {
+                "psr-4": {
+                    "Version\\": "src/"
+                }
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "MIT"
+            ],
+            "authors": [
+                {
+                    "name": "Nikola Poša",
+                    "email": "posa.nikola@gmail.com",
+                    "homepage": "https://www.nikolaposa.in.rs"
+                }
+            ],
+            "description": "Value Object that represents a SemVer-compliant version number.",
+            "homepage": "https://github.com/nikolaposa/version",
+            "keywords": [
+                "semantic",
+                "semver",
+                "version",
+                "versioning"
+            ],
+            "time": "2018-06-14T18:08:16+00:00"
+        },
         {
             "name": "openlss/lib-array2xml",
             "version": "0.5.1",
@@ -700,22 +1138,22 @@
         },
         {
             "name": "phar-io/manifest",
-            "version": "1.0.1",
+            "version": "1.0.3",
             "source": {
                 "type": "git",
                 "url": "https://github.com/phar-io/manifest.git",
-                "reference": "2df402786ab5368a0169091f61a7c1e0eb6852d0"
+                "reference": "7761fcacf03b4d4f16e7ccb606d4879ca431fcf4"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/phar-io/manifest/zipball/2df402786ab5368a0169091f61a7c1e0eb6852d0",
-                "reference": "2df402786ab5368a0169091f61a7c1e0eb6852d0",
+                "url": "https://api.github.com/repos/phar-io/manifest/zipball/7761fcacf03b4d4f16e7ccb606d4879ca431fcf4",
+                "reference": "7761fcacf03b4d4f16e7ccb606d4879ca431fcf4",
                 "shasum": ""
             },
             "require": {
                 "ext-dom": "*",
                 "ext-phar": "*",
-                "phar-io/version": "^1.0.1",
+                "phar-io/version": "^2.0",
                 "php": "^5.6 || ^7.0"
             },
             "type": "library",
@@ -751,20 +1189,20 @@
                 }
             ],
             "description": "Component for reading phar.io manifest information from a PHP Archive (PHAR)",
-            "time": "2017-03-05T18:14:27+00:00"
+            "time": "2018-07-08T19:23:20+00:00"
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