add SensioLabs Insight badge

Author: mikaelcom

README.md

@@ -7,6 +7,7 @@
 [![Code Coverage](https://scrutinizer-ci.com/g/WsdlToPhp/PackageBase/badges/coverage.png)](https://scrutinizer-ci.com/g/WsdlToPhp/PackageBase/)
 [![Dependency Status](https://www.versioneye.com/user/projects/55b10586643533001c00010f/badge.svg)](https://www.versioneye.com/user/projects/55b10586643533001c00010f)
 [![StyleCI](https://styleci.io/repos/38760239/shield)](https://styleci.io/repos/38760239)
+[![SensioLabsInsight](https://insight.sensiolabs.com/projects/bfbc0c8f-5793-489b-8151-36ea149ec98d/mini.png)](https://insight.sensiolabs.com/projects/bfbc0c8f-5793-489b-8151-36ea149ec98d)
 
 ## Main features
 This project contains base classes used as parent class by the generated classes from [PackageGenerator](https://github.com/WsdlToPhp/PackageGenerator):