Changed release version to match the branch

This changes the release version in the to the name of the branch instead of the version number which has no hold on the state of the branch.

This resolves issue https://github.com/rcbops/ansible-lxc-rpc/issues/421
Merge pull request #425 from cloudnull/release-proposed/juno

Backport - Juno - Changed release version to match the branch