Mike

Bug fixes
- Add support for Python 3.7 as well as newer versions of `ruamel.yaml`

---

Bug fixes
- Support defining theme in `mkdocs.yml` as a mapping instead of just a string

---

Bug fixes
- Fix version selection on real Github pages
- Allow re-specifying aliases if they're already set for a version

---

New features
- Add an `alias` command to copy an existing set of docs to a new alias

Breaking changes
- Change the name of the `rename` command to `retitle`

Bug fixes
- Fix handling of remotes so that local changes aren't wiped out
- Rework aliasing to be persistent across deployments

---

New features
- Add support for locally-serving documentation for testing purposes