Update CHANGELOG.md

Author: compulim

CHANGELOG.md

@@ -4,6 +4,6 @@ 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]
+## [1.0.0] - 2018-06-17
 ### Added
 - Initial release