Update changelog

Author: Niels Dequeker

CHANGELOG.md

@@ -1,6 +1,11 @@
-# 2.2.0 (upcoming release)
+# 2.3.0
 
 * Add `data-clone-enabled` option + fix `data-drop-enabled` option ([#411](https://github.com/angular-ui-tree/angular-ui-tree/pull/411))
+* Replaced Grunt with Gulp for the build process ([#435](https://github.com/angular-ui-tree/angular-ui-tree/pull/435))
+
+# 2.2.0
+
+* release has been [reverted](https://github.com/angular-ui-tree/angular-ui-tree/commit/800dd0a43ce105d6301cd42038c1a28dbe3cd21e) to v2.1.5
 
 # 2.1.5 (2014-07-31)