~~~~~~~~~~~~~~~~~~
Changes such that carthorse can cover the same use cases as `ansible-role-createtag`__ without
needing ansible.
__ https://github.com/cjw296/ansible-role-createtag
- Added ``when`` of ``always``.
- Added skipping of version extraction using ``none``.
- Support extracting the project version from an environment variable.
- Make the current datetime available when building the tag.
- Add support for updating existing git tags.