Merge pull request #1828 from fastruby/fixes/reference-codebeat

[documentation] Remove reference to codebeat.co

Author: troessner

README.md

@@ -42,7 +42,6 @@
 * ![Licence](http://img.shields.io/badge/license-MIT-brightgreen.svg)
 * [![Inline docs](https://inch-ci.org/github/troessner/reek.png)](https://inch-ci.org/github/troessner/reek)
 * [![Code Climate](https://codeclimate.com/github/troessner/reek/badges/gpa.svg)](https://codeclimate.com/github/troessner/reek)
-* [![codebeat](https://codebeat.co/badges/42fed4ff-3e55-4aed-8ecc-409b4aa539b3)](https://codebeat.co/projects/github-com-troessner-reek)
 
 
 ## Quickstart