chore(changelog): add v.0.6.0 tag

Author: sleepdefic1t

CHANGELOG.md

@@ -5,7 +5,9 @@ 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
+## [0.6.0-arduino] - 2019-07-01
+
+## [0.6.0] - 2019-07-01
 
 ### Added