Add compatibility notes

.travis.yml

@@ -7,10 +7,15 @@ language: php
 php:
   - 7.2
   - 7.3
+  - 7.4
+
+env:
+  - TESTBENCH_VERSION=4.0
+  - TESTBENCH_VERSION=5.0
 
 before_script:
   - composer global require --no-interaction --prefer-dist --update-no-dev hirak/prestissimo
-  - composer install --no-interaction --prefer-dist
+  - composer require --no-interaction --prefer-dist orchestra/testbench:$TESTBENCH_VERSION
 
 script:
   - bin/phpunit --testsuit unit --testdox

README.md

@@ -13,6 +13,7 @@ Elasticsearch migrations for Laravel allow you to easily modify and share indice
 
 ## Contents
 
+* [Compatibility](#compatibility)
 * [Installation](#installation) 
 * [Configuration](#configuration)
 * [Writing Migrations](#writing-migrations)
@@ -22,6 +23,14 @@ Elasticsearch migrations for Laravel allow you to easily modify and share indice
 * [Migration Status](#migration-status)
 * [Troubleshooting](#migration-status)
 
+## Compatibility
+
+The current version of Elastic Migrations has been tested with the following configuration:
+
+* PHP 7.2-7.4
+* Elasticsearch 7.x
+* Laravel 6.x-7.x
+
 ## Installation
 
 The library can be installed via Composer:

composer.json

@@ -27,12 +27,13 @@
         }
     },
     "require": {
+        "php": "^7.2",
         "babenkoivan/elastic-client": "^1.0",
         "babenkoivan/elastic-adapter": "^1.0"
     },
     "require-dev": {
         "phpunit/phpunit": "^8.4",
-        "orchestra/testbench": "^4.4"
+        "orchestra/testbench": "^5.2"
     },
     "config": {
         "bin-dir": "bin"