Merge pull request #433 from gitter-badger/gitter-badge

Add a Gitter chat badge to README.md

README.md

 ### Status
+
+[![Join the chat at https://gitter.im/gibiansky/IHaskell](https://badges.gitter.im/Join%20Chat.svg)](https://gitter.im/gibiansky/IHaskell?utm_source=badge&utm_medium=badge&utm_campaign=pr-badge&utm_content=badge)
 [![Build Status](https://travis-ci.org/gibiansky/IHaskell.svg?branch=master)](https://travis-ci.org/gibiansky/IHaskell)
 
 ![IHaskell](https://raw.github.com/gibiansky/IHaskell/master/images/ihaskell-logo.png)