enhance changelog

Author: bueltge

CHANGELOG.md

@@ -6,6 +6,13 @@ This project adheres to [Semantic Versioning](http://semver.org/).
 
 ## Unreleased
 
+## 2.0.0 (2018-09-15)
+
+* Add new possibilities for markdown syntax.
+* Maintain new refactor in context of rules.
+* Maintain unit tests about all methods, rules.
+
 ## 1.0.0 (2017-09-02)
+
  * First public version.