Add code climate badge to readme

README.md

@@ -5,6 +5,7 @@
 [![Coverage Status](https://coveralls.io/repos/github/Stratadox/HydrationMapper/badge.svg?branch=master)](https://coveralls.io/github/Stratadox/HydrationMapper?branch=master)
 [![Infection Minimum](https://img.shields.io/badge/msi-100-brightgreen.svg)](https://travis-ci.org/Stratadox/HydrationMapping)
 [![Scrutinizer Code Quality](https://scrutinizer-ci.com/g/Stratadox/HydrationMapper/badges/quality-score.png?b=master)](https://scrutinizer-ci.com/g/Stratadox/HydrationMapper/?branch=master)
+[![Maintainability](https://api.codeclimate.com/v1/badges/6370c294ff33dec95c25/maintainability)](https://codeclimate.com/github/Stratadox/HydrationMapper/maintainability)
 [![Latest Stable Version](https://poser.pugx.org/stratadox/hydration-mapper/v/stable)](https://packagist.org/packages/stratadox/hydration-mapper)
 [![License](https://poser.pugx.org/stratadox/hydration-mapper/license)](https://packagist.org/packages/stratadox/hydration-mapper)