Added Twitter badge

[ci skip]

README.md

@@ -9,6 +9,7 @@
 [![npm](https://img.shields.io/badge/npm-wiki.js-blue.svg?style=flat-square)](https://www.npmjs.com/package/wiki.js)
 [![Downloads](https://img.shields.io/github/downloads/Requarks/wiki/total.svg?style=flat-square)](https://www.npmjs.com/package/wiki.js)
 [![Chat on Gitter](https://img.shields.io/badge/chat-on_gitter-CC2B5E.svg?style=flat-square&logo=image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAcAAAAOCAMAAADUg/YpAAAABlBMVEUAAAD///%2Bl2Z/dAAAAAXRSTlMAQObYZgAAABVJREFUeAFjwAUYYTQByAAh0WicAAAFnwAYeB5bLwAAAABJRU5ErkJggg==)](https://gitter.im/Requarks/wiki)
+[![Twitter Follow](https://img.shields.io/twitter/follow/requarks.svg?style=flat-square&label=twitter)](https://twitter.com/requarks)  
 [![Build Status](https://img.shields.io/travis/Requarks/wiki/master.svg?style=flat-square)](https://travis-ci.org/Requarks/wiki)
 [![Codacy Badge](https://img.shields.io/codacy/grade/1d0217a3153c4595bdedb322263e55c8/master.svg?style=flat-square)](https://www.codacy.com/app/Requarks/wiki)
 [![Dependency Status](https://img.shields.io/gemnasium/Requarks/wiki.svg?style=flat-square)](https://gemnasium.com/github.com/Requarks/wiki)