bump version to 4.0.0

bump version to 4.0.0-beta3

bump version to 4.0.0-beta2

bump version to 4.0.0-beta1

bump version to 4.0.0-alpha2

update changelog and bump version to 3.2.1

update changelog and bump version to 3.2.0

update changelog and bump version to 3.1.0

update changelog and bump version to 3.0.0

update changelog and bump version to 2.2.1