add badge

Author: JBlond

README.md

@@ -1,7 +1,7 @@
 PHP Diff Class
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-[![SensioLabsInsight](https://insight.sensiolabs.com/projects/aa609edb-cdb1-45cf-ad51-afbdab48f6a1/mini.png)](https://insight.sensiolabs.com/projects/aa609edb-cdb1-45cf-ad51-afbdab48f6a1)
+[![SensioLabsInsight](https://insight.sensiolabs.com/projects/aa609edb-cdb1-45cf-ad51-afbdab48f6a1/mini.png)](https://insight.sensiolabs.com/projects/aa609edb-cdb1-45cf-ad51-afbdab48f6a1) [![Codacy Badge](https://api.codacy.com/project/badge/Grade/db5f8d57b1234502aeb852afc87e0dfe)](https://www.codacy.com/app/leet31337/php-diff)
 
 [![Latest Version](https://img.shields.io/github/release/JBlond/php-diff.svg?style=flat-square&label=Release)](https://github.com/JBlond/php-diff/releases)