Update version.py

Update version.py for 0.8 release

Update version.py

Update version.py

Add release notes and set version to 0.5.0

Update version.py for 0.4.0

Update version.py

Changing version.py to match the release version

Update version.py to 0.2.0

Update version.py to 0.2.0-rc1

Update version.py for 0.2.0-rc0

Update release.md with 0.1.1 release.

PiperOrigin-RevId: 205810493