Adjust CS badge

Author: dereuromark

README.md

@@ -7,7 +7,7 @@
 [![Minimum PHP Version](https://img.shields.io/badge/php-%3E%3D%208.2-8892BF.svg)](https://php.net/)
 [![License](https://poser.pugx.org/dereuromark/cakephp-tinyauth/license.svg)](LICENSE)
 [![Total Downloads](https://poser.pugx.org/dereuromark/cakephp-tinyauth/d/total.svg)](https://packagist.org/packages/dereuromark/cakephp-tinyauth)
-[![Coding Standards](https://img.shields.io/badge/cs-PSR--2--R-yellow.svg)](https://github.com/php-fig-rectified/fig-rectified-standards)
+[![Coding Standards](https://img.shields.io/badge/cs-PSR--2--R-purple.svg?style=flat-square)](https://github.com/php-fig-rectified/fig-rectified-standards)
 
 A CakePHP plugin to handle authentication and user authorization the easy way.