prepare to new tag

CHANGELOG.md

@@ -3,6 +3,8 @@ All notable changes to this project will be documented in this file.
 This project adheres to [Semantic Versioning](http://semver.org/).
 
 ## [Unreleased][unreleased]
+
+## [v0.2.0] - 2015-10-27
 ### Added
 - This CHANGELOG file.
 - Validity of suspension automata.