Prepare release 2.0.3

Author: MarioBlazek

doc/CHANGELOG.md

@@ -6,7 +6,7 @@ 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/).
 
-## [2.0.3] - unreleased
+## [2.0.3] - 01-12-2018
 ### Added
 - support for eZ admin v2 by @darinda