Fix url badge in README.md.

Author: terabytesoftw

README.md

@@ -47,7 +47,7 @@ to the require-dev section of your `composer.json` file.
 ## Support versions Yii2
 
 [![Yii20](https://img.shields.io/badge/Yii2%20version-2.0-blue)](https://github.com/yiisoft/yii2/tree/2.0.49.3)
-[![Yii22](https://img.shields.io/badge/Yii2%20version-2.2-blue)](https://img.shields.io/badge/Yii2%20version-2.2-blue)
+[![Yii22](https://img.shields.io/badge/Yii2%20version-2.2-blue)](https://github.com/yiisoft/yii2/tree/2.2)
 
 ## Testing