Add Gitter badge

gitter-badger · gitter-badger · commit 6788da2192fb · 2018-05-23T19:06:05.000Z
diff --git a/README.md b/README.md
@@ -2,7 +2,7 @@
 
 [![Build Status](https://travis-ci.org/commercialhaskell/stack.svg?branch=master)](https://travis-ci.org/commercialhaskell/stack)
 [![Windows build status](https://ci.appveyor.com/api/projects/status/c1c7uvmw6x1dupcl?svg=true)](https://ci.appveyor.com/project/snoyberg/stack)
-[![Release](https://img.shields.io/github/release/commercialhaskell/stack.svg)](https://github.com/commercialhaskell/stack/releases)
+[![Release](https://img.shields.io/github/release/commercialhaskell/stack.svg)](https://github.com/commercialhaskell/stack/releases) [![Join the chat at https://gitter.im/commercialhaskell/stack](https://badges.gitter.im/commercialhaskell/stack.svg)](https://gitter.im/commercialhaskell/stack?utm_source=badge&utm_medium=badge&utm_campaign=pr-badge&utm_content=badge)
 
 Stack is a cross-platform program for developing Haskell projects. It is intended for Haskellers both new and experienced.
 
