docs: updated CHANGELOG

Author: matq007

CHANGELOG.md

@@ -5,7 +5,7 @@ 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).
 
-## dev nfcore/rnafusion
+## [1.2.0] nfcore/rnafusion - 2020/07/15
 
 ### Added