Update CHANGELOG

Author: Lionel Laské

CHANGELOG.md

@@ -5,6 +5,8 @@ The format is based on [Keep a Changelog](http://keepachangelog.com/en/1.0.0/)
 and this project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.html).
 
 ## [Unreleased]
+
+## [1.1.0] - 2019-05-12
 ### Added
 - Add classroom handling in dashboard
 - Dashboard is now responsive to be usable on smartphone