Fixes #2237: added Scrutinizer check.

README.md

@@ -22,7 +22,7 @@ which is the latest stable release of Yii.
 [![Total Downloads](https://poser.pugx.org/yiisoft/yii2/downloads.png)](https://packagist.org/packages/yiisoft/yii2)
 [![Build Status](https://secure.travis-ci.org/yiisoft/yii2.png)](http://travis-ci.org/yiisoft/yii2)
 [![Dependency Status](https://www.versioneye.com/php/yiisoft:yii2/dev-master/badge.png)](https://www.versioneye.com/php/yiisoft:yii2/dev-master)
-
+[![Scrutinizer Quality Score](https://scrutinizer-ci.com/g/yiisoft/yii2/badges/quality-score.png?s=b1074a1ff6d0b214d54fa5ab7abbb90fc092471d)](https://scrutinizer-ci.com/g/yiisoft/yii2/)
 
 DIRECTORY STRUCTURE
 -------------------