Remove codeclimate (#55)

Author: fabianfett

.codeclimate.yml

@@ -11,7 +11,6 @@
 <p>
     <a href="https://gitlab.com/Mordil/RediStack/pipelines"><img src="https://gitlab.com/Mordil/RediStack/badges/master/pipeline.svg" alt="Build Status"></a>
     <a href="https://docs.redistack.info"><img src="https://docs.redistack.info/badge.svg" alt="Documentation Coverage"></a>
-    <a href="https://codeclimate.com/github/Mordil/RediStack/maintainability"><img src="https://api.codeclimate.com/v1/badges/b6fd5e7a3e669165a21b/maintainability" /></a>
 </p>
 </div>