Update changelog.

Author: Herre Groen

CHANGELOG.md

@@ -4,9 +4,14 @@ All notable changes to this project will be documented in this file.
 The format is based on [Keep a Changelog](http://keepachangelog.com/) 
 and this project adheres to [Semantic Versioning](http://semver.org/).
 
-## 2.1.0
+## 3.0.0
+
+### Added
 - Added functionality to handle how the i18n-promobox notification is displayed.
 
+### Changed
+- [DEPRECATION] Postfix all classes with _v3. This prevents autoload collisions with 2.0 versions.
+
 ## 2.0.0
 
 ### Added