Merge pull request kubernetes-client#384 from mbohlool/release-4.0

Release 4.0

Update version constants for release-4.0

Update version constants for 3.0 release

Update version constants for 3.0.0a1 release

Update version constants for 3.0.0a1 release

Release 1.0.2

Update versions for 2.0.0b1 release

Release 1.0.1

Release 2.0.0a