Updated container provisioning script to use v0.11.0-rc1.
Updated container provisioning script to use v0.11.0-rc1.

This commit bumps the container provisioning script to use Mutagen
v0.11.0-rc1 as its default version.

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

havoc-io/mutagen,havoc-io/mutagen