Adding code coverage badge.

README.md

@@ -1,6 +1,7 @@
 # gulp-ember-emblem
 
-[![NPM version][npm-image]][npm-url] [![Build status][travis-image]][travis-url] [![Code Climate][codeclimate-image]][codeclimate-url] [![Dependencies][david-image]][david-url]
+[![NPM version][npm-image]][npm-url] [![Build status][travis-image]][travis-url] [![Code Climate][codeclimate-image]][codeclimate-url] [![Coverage Status][coverage-image]][coverage-url] [![Dependencies][david-image]][david-url]
+
 
 This is a gulp plugin to process [Emblem.js](http://emblemjs.com) templates specifically for [Ember](http://emberjs.com/).
 
@@ -55,6 +56,8 @@ Compiler options to pass to `Emblem.precompile()`.
 [npm-image]: https://badge.fury.io/js/gulp-ember-emblem.png
 [codeclimate-image]: https://codeclimate.com/github/wbyoung/gulp-ember-emblem.png
 [codeclimate-url]: https://codeclimate.com/github/wbyoung/gulp-ember-emblem
+[coverage-image]: https://coveralls.io/repos/wbyoung/gulp-ember-emblem/badge.png
+[coverage-url]: https://coveralls.io/r/wbyoung/gulp-ember-emblem
 [david-image]: https://david-dm.org/wbyoung/gulp-ember-emblem.png?theme=shields.io
 [david-url]: https://david-dm.org/wbyoung/gulp-ember-emblem