doc: Add Gitter badge in Readme

README.md

@@ -1,8 +1,9 @@
 # Zeal
 
 [![Changelog](https://img.shields.io/github/release/zealdocs/zeal.svg?style=flat-square)](https://github.com/zealdocs/zeal/releases)
-[![IRC](https://img.shields.io/badge/chat-on%20irc-blue.svg?style=flat-square)](https://kiwiirc.com/client/irc.freenode.net/#zealdocs)
+[![Gitter](https://img.shields.io/gitter/room/zealdocs/zeal.svg?style=flat-square)](https://gitter.im/zealdocs/zeal)
 [![Telegram Chat](https://img.shields.io/badge/chat-on%20telegram-179cde.svg?style=flat-square)](https://telegram.me/zealdocschat)
+[![IRC](https://img.shields.io/badge/chat-on%20irc-blue.svg?style=flat-square)](https://kiwiirc.com/client/irc.freenode.net/#zealdocs)
 [![Telegram Channel](https://img.shields.io/badge/follow-on%20telegram-179cde.svg?style=flat-square)](https://telegram.me/zealdocs)
 [![Twitter](https://img.shields.io/badge/follow-on%20twitter-1da1f2.svg?style=flat-square)](https://twitter.com/zealdocs)