Add MIT license badge

README.md

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 V8Js
 ====
 
-[![Join the chat at https://gitter.im/preillyme/v8js](https://badges.gitter.im/Join%20Chat.svg)](https://gitter.im/preillyme/v8js?utm_source=badge&utm_medium=badge&utm_campaign=pr-badge&utm_content=badge)
+[![GitHub license](https://img.shields.io/badge/license-MIT-blue.svg)](https://raw.githubusercontent.com/preillyme/v8js/master/LICENSE) [![Join the chat at https://gitter.im/preillyme/v8js](https://badges.gitter.im/Join%20Chat.svg)](https://gitter.im/preillyme/v8js?utm_source=badge&utm_medium=badge&utm_campaign=pr-badge&utm_content=badge)
 
 V8Js is a PHP extension for Google's V8 Javascript engine.