Fixed coveralls badge

README.md

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-# [WooCommerce](http://www.woothemes.com/woocommerce/) [![Built with Grunt](https://cdn.gruntjs.com/builtwith.png)](http://gruntjs.com/) [![Build Status](https://api.travis-ci.org/woothemes/woocommerce.svg?branch=master)](http://travis-ci.org/woothemes/woocommerce) [![Coverage Status](https://img.shields.io/coveralls/woothemes/woocommerce.svg)](https://coveralls.io/r/woothemes/woocommerce)
+# [WooCommerce](http://www.woothemes.com/woocommerce/) [![Built with Grunt](https://cdn.gruntjs.com/builtwith.png)](http://gruntjs.com/) [![Build Status](https://api.travis-ci.org/woothemes/woocommerce.svg?branch=master)](http://travis-ci.org/woothemes/woocommerce) [![Coverage Status](https://coveralls.io/repos/woothemes/woocommerce/badge.svg?branch=master&service=github)](https://coveralls.io/github/woothemes/woocommerce?branch=master)
 
 Welcome to the WooCommerce repository on GitHub. Here you can browse the source, look at open issues and keep track of development. We recommend all developers to follow the [WooCommerce development blog](http://develop.woothemes.com/woocommerce/) to stay up to date about everything happening in the project. You can also [follow @DevelopWC](https://twitter.com/DevelopWC) on Twitter for the latest development updates.