Badges and requirements info added to README.

Author: remorhaz

README.md

@@ -1,11 +1,16 @@
-PHP JSON Pointer
-================
+# PHP JSON Pointer
+
 [![Build Status](https://travis-ci.org/remorhaz/php-json-pointer.svg?branch=master)](https://travis-ci.org/remorhaz/php-json-pointer)
+[![Latest Stable Version](https://poser.pugx.org/remorhaz/php-json-pointer/v/stable)](https://packagist.org/packages/remorhaz/php-json-pointer)
+[![License](https://poser.pugx.org/remorhaz/php-json-pointer/license)](https://packagist.org/packages/remorhaz/php-json-pointer)
 [![Code Climate](https://codeclimate.com/github/remorhaz/php-json-pointer/badges/gpa.svg)](https://codeclimate.com/github/remorhaz/php-json-pointer)
 [![Test Coverage](https://codeclimate.com/github/remorhaz/php-json-pointer/badges/coverage.svg)](https://codeclimate.com/github/remorhaz/php-json-pointer/coverage)
 
 This library allows usage of [RFC6901](https://tools.ietf.org/html/rfc6901)-compliant JSON pointers with PHP variables.
 
+##Requirements
+* PHP 5.6+/PHP 7.0+/HHVM
+
 #License
 PHP JSON Pointer is licensed under MIT license.