Update badge

Author: j0k3r

.scrutinizer.yml

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+tools:
+    external_code_coverage: false

README.md

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 # Graby
 
 [![Build Status](https://travis-ci.org/j0k3r/graby.svg?branch=master)](https://travis-ci.org/j0k3r/graby)
-[![Code Coverage](https://scrutinizer-ci.com/g/j0k3r/graby/badges/coverage.png?b=master)](https://scrutinizer-ci.com/g/j0k3r/graby/?branch=master)
+[![Coverage Status](https://coveralls.io/repos/j0k3r/graby/badge.svg?branch=master&service=github)](https://coveralls.io/github/j0k3r/graby?branch=master)
 [![Scrutinizer Code Quality](https://scrutinizer-ci.com/g/j0k3r/graby/badges/quality-score.png?b=master)](https://scrutinizer-ci.com/g/j0k3r/graby/?branch=master)
 
 Graby helps you extract article content from web pages.