updated changelog

Author: massimozappino

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/)
 and this project adheres to [Semantic Versioning](http://semver.org/).
 
-## [1.2.0] - (unreleased)
+## [1.2.0] - (2017-11-05)
 ### Changed
 - renamed LanguagesCollection and SnippetsCollection
 - rewritten synchronization snippets logic