Bump version to 0.6.0 and update CHANGES.md

Bump version to 0.5.2 and update CHANGES.md

Bump version to 0.5.1 and update CHANGES.md

Bump version to 0.5.0 and update CHANGES.md

Bump version to 0.4.0 and update CHANGES.md

Bump version to 0.3.0 and update CHANGES.md

Bump version to 0.2.0 and update CHANGES.md

Bump version to 0.1.0 and update CHANGES.md