Fix changelog

Author: aslakhellesoy

CHANGELOG.md

@@ -6,6 +6,8 @@ The format is based on [Keep a Changelog](http://keepachangelog.com/)
 and this project adheres to [Semantic Versioning](http://semver.org/).
 
 ## [Unreleased]
+
+### Added
 - Added context to python snippet to properly support `behave`
 - Added `ParameterType` support to the python language implementation. This is currently supported via [cuke4behave](http://gitlab.com/cuke4behave/cuke4behave)