README: Adds coveralls badge.

README.md

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-# node-sass
+# node-sass
 
 <table>
   <tr>
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 [![npm version](https://badge.fury.io/js/node-sass.svg)](http://badge.fury.io/js/node-sass)
 [![Dependency Status](https://david-dm.org/sass/node-sass.svg?theme=shields.io)](https://david-dm.org/sass/node-sass)
 [![devDependency Status](https://david-dm.org/sass/node-sass/dev-status.svg?theme=shields.io)](https://david-dm.org/sass/node-sass#info=devDependencies)
-[![Gitter chat](http://img.shields.io/badge/gitter-sass/node--sass-brightgreen.svg)](https://gitter.im/sass/node-sass)
+[![Coverage Status](https://coveralls.io/repos/sass/node-sass/badge.svg?branch=master)](https://coveralls.io/r/sass/node-sass?branch=master)
 [![Inline docs](http://inch-ci.org/github/sass/node-sass.svg?branch=master)](http://inch-ci.org/github/sass/node-sass)
+[![Gitter chat](http://img.shields.io/badge/gitter-sass/node--sass-brightgreen.svg)](https://gitter.im/sass/node-sass)
 
 Node-sass is a library that provides binding for Node.js to [libsass], the C version of the popular stylesheet preprocessor, Sass.