Bumped version to v0.11.0-beta4.
Bumped version to v0.11.0-beta4.

This commit bumps the version to v0.11.0-beta4.

Signed-off-by: Jacob Howard <f862f167b85d41b225785c70d70808bc7337c1fe@havoc.io>

havoc-io/mutagen,havoc-io/mutagen