Update CHANGELOG

Author: svenstaro

CHANGELOG.md

@@ -9,6 +9,7 @@ and this project adheres to [Semantic Versioning](http://semver.org/).
 
 ## [Unreleased] - ReleaseDate
 - Add docker_build module [#103](https://github.com/svenstaro/genact/pull/103) (thanks @Kovah)
+- Refactored modules to implement a common trait
 
 ## [0.10.0] - 2020-08-27
 - Add `--exit-after-modules` options which can be used to make genact exit after running that many modules