added CHANGELOG line for PSR4 directory move

framework/CHANGELOG.md

@@ -81,6 +81,8 @@ Yii Framework 2 Change Log
 - Chg: Changed the signature of `urlCreator` and button creators for `yii\gridview\ActionColumn` (qiangxue)
 - Chg: Updated HTMLPurified dependency to `4.6.*`.
 - Chg: Changed Yii autoloader to support loading PSR-4 classes only (i.e. PEAR-styled classes not supported anymore) (qiangxue)
+- Chg: Changed the directory structure of the framework repository according to PSR-4.
+       You have to update your applications index.php and yii console file to point to the right location for Yii.php
 - Chg: Advanced app template: moved database connection DSN, login and password to `-local` config not to expose it to VCS (samdark)
 - New #66: [Auth client library](https://github.com/yiisoft/yii2-authclient) OpenId, OAuth1, OAuth2 clients (klimov-paul)
 - New #1393: [Codeception testing framework integration](https://github.com/yiisoft/yii2-codeception) (Ragazzo)