Removed link to the ReviewNinja from README.md

Author: valgog

README.md

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 SProcWrapper
 ============
 
-[![Build Status](https://travis-ci.org/zalando/java-sproc-wrapper.svg)](https://travis-ci.org/zalando/java-sproc-wrapper) [![Coverage Status](https://coveralls.io/repos/zalando/java-sproc-wrapper/badge.png)](https://coveralls.io/r/zalando/java-sproc-wrapper)
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-[![ReviewNinja](http://app.review.ninja/assets/images/wereviewninja-32.png)](http://app.review.ninja/zalando/java-sproc-wrapper)
+[![Build Status](https://travis-ci.org/zalando/java-sproc-wrapper.svg)](https://travis-ci.org/zalando/java-sproc-wrapper) [![Coverage Status](https://coveralls.io/repos/zalando/java-sproc-wrapper/badge.svg)](https://coveralls.io/r/zalando/java-sproc-wrapper)
 
 Library to make PostgreSQL stored procedures(SProcs) available through simple Java "SProcService" interfaces including automatic object serialization and deserialization (using typemapper and convention-over-configuration).