Add gitter badge to readme

KodrAus · web-flow · commit addd78cf42ba · 2018-09-24T16:30:43.000+10:00
[skip-ci]
diff --git a/README.md b/README.md
@@ -1,4 +1,4 @@
-# `auto_impl` [![Build Status](https://travis-ci.org/auto-impl-rs/auto_impl.svg?branch=master)](https://travis-ci.org/auto-impl-rs/auto_impl) [![Crates.io](https://img.shields.io/crates/v/auto_impl.svg)](https://crates.io/crates/auto_impl)
+# `auto_impl` [![Join the chat at https://gitter.im/auto-impl-rs/Lobby](https://badges.gitter.im/Join%20Chat.svg)](https://gitter.im/auto-impl-rs/Lobby?utm_source=badge&utm_medium=badge&utm_campaign=pr-badge&utm_content=badge) [![Build Status](https://travis-ci.org/auto-impl-rs/auto_impl.svg?branch=master)](https://travis-ci.org/auto-impl-rs/auto_impl) [![Crates.io](https://img.shields.io/crates/v/auto_impl.svg)](https://crates.io/crates/auto_impl)
 
 A simple compiler plugin for automatically implementing a trait for some common smart pointers and closures.
 

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`1`		-# `auto_impl` [![Build Status](https://travis-ci.org/auto-impl-rs/auto_impl.svg?branch=master)](https://travis-ci.org/auto-impl-rs/auto_impl) [![Crates.io](https://img.shields.io/crates/v/auto_impl.svg)](https://crates.io/crates/auto_impl)
	`1`	+# `auto_impl` [![Join the chat at https://gitter.im/auto-impl-rs/Lobby](https://badges.gitter.im/Join%20Chat.svg)](https://gitter.im/auto-impl-rs/Lobby?utm_source=badge&utm_medium=badge&utm_campaign=pr-badge&utm_content=badge) [![Build Status](https://travis-ci.org/auto-impl-rs/auto_impl.svg?branch=master)](https://travis-ci.org/auto-impl-rs/auto_impl) [![Crates.io](https://img.shields.io/crates/v/auto_impl.svg)](https://crates.io/crates/auto_impl)
`2`	`2`
`3`	`3`	`A simple compiler plugin for automatically implementing a trait for some common smart pointers and closures.`
`4`	`4`