added coveralls

README.md

@@ -1,6 +1,6 @@
 # next-css-json-loader
 
-[![NPM version][npm-image]][npm-url] [![Downloads][downloads-image]][npm-url] [![Build Status][travis-image]][travis-url] [![Dependency status][david-dm-image]][david-dm-url] [![Dev Dependency status][david-dm-dev-image]][david-dm-dev-url]
+[![NPM version][npm-image]][npm-url] [![Downloads][downloads-image]][npm-url] [![Build Status][travis-image]][travis-url] [![Dependency status][david-dm-image]][david-dm-url] [![Dev Dependency status][david-dm-dev-image]][david-dm-dev-url] [![Coverage Status][coveralls-image]][coveralls-url]
 
 [npm-url]:https://npmjs.org/package/next-css-json-loader
 [downloads-image]:http://img.shields.io/npm/dm/next-css-json-loader.svg
@@ -11,3 +11,5 @@
 [david-dm-image]:https://img.shields.io/david/jozanza/next-css-json-loader.svg
 [david-dm-dev-url]:https://david-dm.org/jozanza/next-css-json-loader#info=devDependencies
 [david-dm-dev-image]:https://img.shields.io/david/dev/jozanza/next-css-json-loader.svg
+[coveralls-image]:https://coveralls.io/repos/github/jozanza/next-css-json-loader/badge.svg?branch=master
+[coveralls-url]:https://coveralls.io/github/jozanza/next-css-json-loader?branch=master