- fix corage status badg link

Author: Erwan Carriou

README.md

@@ -3,7 +3,7 @@
 [![npm version](https://badge.fury.io/js/system-runtime.svg)](http://badge.fury.io/js/system-runtime)
 [![Build Status](https://travis-ci.org/system-sdk/system-runtime.svg?branch=master)](https://travis-ci.org/system-sdk/system-runtime)
 [![Sauce Test Status](https://saucelabs.com/buildstatus/system-runtime)](https://saucelabs.com/u/system-runtime)
-[![Coverage Status](https://img.shields.io/coveralls/system-sdk/system-runtime.svg)](https://coveralls.io/r/system-sdk/system-runtime)
+[![Coverage Status](https://coveralls.io/repos/github/system-sdk/system-runtime/badge.svg?branch=master)](https://coveralls.io/github/system-sdk/system-runtime?branch=master)
 [![devDependency Status](https://david-dm.org/system-sdk/system-runtime/dev-status.svg)](https://david-dm.org/system-sdk/system-runtime#info=devDependencies)
 
 ## What is SyrupJS ?