Dropped php 7.0 & 7.1 support (#13)

* reduced number of supported php versions

* Dropped php 7.0 and 7.1 support

.github/workflows/testsuite.yml

@@ -16,7 +16,7 @@ jobs:
     strategy:
       matrix:
         operating-system: [ubuntu-latest, windows-latest, macOS-latest]
-        php-versions: ['7.0', '7.1', '7.2', '7.3', '7.4']
+        php-versions: ['7.2', '7.3', '7.4']
 
     steps:
       - uses: actions/checkout@master

README.md

@@ -1,5 +1,7 @@
 # PHP To String
 
+Simple library that converts PHP values into strings.
+
 Status: 
 
 * ![Build Status](https://github.com/coduo/php-to-string/workflows/Tests/badge.svg?branch=master) - master
@@ -9,12 +11,8 @@ Simple library that allows you to cast any php value into string
 
 ## Installation
 
-Add to your composer.json
-
 ```
-require: {
-   "coduo/php-to-string": "2.0.*"
-}
+composer require coduo/php-to-string
 ```
 
 ## Usage
@@ -25,7 +23,7 @@ Supported types:
 * integer
 * float/double
 * object
-* callback
+* callable
 * array
 * resource
 

composer.json

@@ -15,7 +15,7 @@
         }
     ],
     "require": {
-        "php": "^7.0",
+        "php": "^7.2",
         "symfony/intl": "^3.4|^4.0|^5.0"
     },
     "require-dev": {