removed CHANGELOG for 2.0 as it is not maintained anymore
Merge branch '2.1' into 2.2

* 2.1:
  removed CHANGELOG for 2.0 as it is not maintained anymore

Conflicts:
	CHANGELOG-2.0.md
Merge branch '2.2'

* 2.2:
  removed CHANGELOG for 2.0 as it is not maintained anymore
updated version to 2.4