update coverage url badge

Author: Emmanuel ROECKER

README.md

@@ -2,7 +2,7 @@
 
 [![Scrutinizer Code Quality](https://scrutinizer-ci.com/g/emmanuelroecker/php-simply-html/badges/quality-score.png?b=master)](https://scrutinizer-ci.com/g/emmanuelroecker/php-simply-html/?branch=master)
 [![Build Status](https://travis-ci.org/emmanuelroecker/php-simply-html.svg?branch=master)](https://travis-ci.org/emmanuelroecker/php-simply-html)
-[![Coverage Status](https://coveralls.io/repos/emmanuelroecker/php-simply-html/badge.svg?branch=master&service=github)](https://coveralls.io/github/emmanuelroecker/php-simply-html?branch=master)
+[![Coverage Status](https://coveralls.io/repos/github/emmanuelroecker/php-simply-html/badge.svg?branch=master)](https://coveralls.io/github/emmanuelroecker/php-simply-html?branch=master)
 [![SensioLabsInsight](https://insight.sensiolabs.com/projects/f2f6d5fe-633a-4318-9136-d2abeaf61419/mini.png)](https://insight.sensiolabs.com/projects/f2f6d5fe-633a-4318-9136-d2abeaf61419)
 [![Dependency Status](https://www.versioneye.com/user/projects/568160c0eb4f47003000020c/badge.svg?style=flat-square)](https://www.versioneye.com/user/projects/568160c0eb4f47003000020c)