Add badges

Author: AlexMasterov

README.md

@@ -1,9 +1,14 @@
 ## MsgPack
 
+[![Latest Stable Version](https://poser.pugx.org/alexmasterov/msgpack.php/v/stable)](https://packagist.org/packages/alexmasterov/msgpack.php)
+[![GitHub license](https://img.shields.io/badge/license-MIT-blue.svg)](https://raw.githubusercontent.com/AlexMasterov/msgpack.php/master/LICENSE)
 [![Build Status](https://travis-ci.org/AlexMasterov/msgpack.php.svg)](https://travis-ci.org/AlexMasterov/msgpack.php)
+[![Code Coverage](https://scrutinizer-ci.com/g/AlexMasterov/msgpack.php/badges/coverage.png?b=master)](https://scrutinizer-ci.com/g/AlexMasterov/msgpack.php/?branch=master)
 
 A pure and efficient [MessagePack](https://msgpack.org) serialization library.
 
+It is influenced by the design of [rybakit/msgpack.php](https://github.com/rybakit/msgpack.php), but reworked internal with focus on performance.
+
 ## Installation
 
 The suggested installation method is via [composer](https://getcomposer.org/):