Bump to v0.6.0 for release (#303)

Signed-off-by: Jon Bodner <jbodner@buf.build>

Release 0.5.0 (#301)

Release `0.4.0` (#268)

Release `0.3.0` (#195)

Release `0.2.0` (#147)

Signed-off-by: Sri Krishna <skrishna@buf.build>

Release 0.1.0 (#125)

Add badges to README.md (#122)