Update README.md

Author: Igor Chepurnoy

README.md

@@ -15,6 +15,7 @@ Yii2-RBAC provides a web interface for advanced access control and includes foll
 
 [![Latest Stable Version](https://poser.pugx.org/yii2mod/yii2-rbac/v/stable)](https://packagist.org/packages/yii2mod/yii2-rbac) [![Total Downloads](https://poser.pugx.org/yii2mod/yii2-rbac/downloads)](https://packagist.org/packages/yii2mod/yii2-rbac) [![License](https://poser.pugx.org/yii2mod/yii2-rbac/license)](https://packagist.org/packages/yii2mod/yii2-rbac)
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 Installation
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