Remove gitter badge

Author: ncb000gt

README.md

@@ -1,7 +1,4 @@
 # node.bcrypt.js
-
-[![Join the chat at https://gitter.im/ncb000gt/node.bcrypt.js](https://badges.gitter.im/Join%20Chat.svg)](https://gitter.im/ncb000gt/node.bcrypt.js?utm_source=badge&utm_medium=badge&utm_campaign=pr-badge&utm_content=badge)
-
 [![Build Status](https://travis-ci.org/kelektiv/node.bcrypt.js.svg?branch=master)](https://travis-ci.org/kelektiv/node.bcrypt.js)
 [![Dependency Status](https://david-dm.org/kelektiv/node.bcrypt.js.svg)](https://david-dm.org/kelektiv/node.bcrypt.js)