Update CHANGELOG for v1.0.0

Author: razor-x

CHANGELOG.md

@@ -5,6 +5,8 @@ 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/).
 
-## [Unreleased]
+## 1.0.0 / 2018-02-04
 
-[Unreleased]: https://github.com/rxrc/curator/compare/v0.0.0...HEAD
+- Initial release.
+
+[Unreleased]: https://github.com/rxrc/curator/compare/v1.0.0...HEAD