docs: add changelog for 4.2.0-beta.0

docs: add changelog for 4.1.1

docs: add changelog for 4.1.0

docs: add changelog for 4.1.0-rc.0

docs: add changelog for 4.0.3

docs: add changelog for 4.0.2

docs: add changelog for 4.1.0-beta.0

docs: add changelog for 4.0.1

docs: add changelog for 4.0.0

release: cut the 4.0.0-rc.6 release