update version and changelog to v2.4.1
update version and changelog to v2.4.0
update version and changelog to v2.3.0
update version and docs to v2.2
update docs and version to v2.1
update docs and version to v2.0
update docs for v1.8
update changelog and version to 1.6
update docs for v1.5
update docs for v1.4