add StyleCI badge

Author: mikaelcom

README.md

@@ -4,6 +4,7 @@
 [![Scrutinizer Code Quality](https://scrutinizer-ci.com/g/WsdlToPhp/PackageBase/badges/quality-score.png)](https://scrutinizer-ci.com/g/WsdlToPhp/PackageBase/)
 [![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)
 
 ## Main features
 This project contains base classes used as parent class by the generated classes from [PackageGenerator](https://github.com/WsdlToPhp/PackageGenerator):