Update CHANGELOG

Author: Lionel Laské

CHANGELOG.md

@@ -4,7 +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/en/1.0.0/)
 and this project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.html).
 
-## [Unreleased]
+## [1.2.0] - 2019-09-26
 ### Added
 - Write activity
 - Constellation activity
@@ -69,7 +69,7 @@ and this project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.
 - Localize activity name in title
 - Activity palette icon has reversed colors
 - XOEditor activity generate multiple entries in the Journal #370
-- Clear icon in XOEditor activity is not consistent #372 
+- Clear icon in XOEditor activity is not consistent #372
 
 
 ## [1.1.0] - 2019-01-20