Update the changelog for v0.11.0

Author: andreaskoch

CHANGELOG.md

@@ -4,6 +4,7 @@ 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/).
 
-## [Unreleased]
+## [v0.11.0] - 2016-11-09
+
 ### Changed
 - Allow access to the Magento Connect Manager (see issue #29)