New features
- Remove `mike install-extras` and replace it with an MkDocs plugin; if you
previously used `install-extras`, be sure to remove the added JS/CSS from your
docs directory
- When deploying aliases, deploy redirect pages to the real version by default;
pass `--no-redirect` to deploy copies
- Improve the default redirect template to support redirection when the user has
disabled JavaScript
- Allow deploying docs to a subdirectory within the target branch via `--prefix`
- Add support for custom templates with `mike set-default`
- Read from `remote_branch` and `remote_name` if set in `mkdocs.yml`
- Allow updating an existing alias with `mike alias -u`
Breaking changes
- Require Python 3.6+
- Remove support for installing extras for `material` theme since `material`
now has [built-in support][material-mike] for mike
Bug fixes
- Canonical URLs in generated documentation now point to the correct location
- `mike alias` now checks for existing aliases to prevent erroneously setting an
alias for two different versions
- Replace `packaging` dependency with `verspec` for future stability
- Validate version and alias names to ensure they're non-empty and don't
contain a directory separator
[material-mike]: https://squidfunk.github.io/mkdocs-material/setup/setting-up-versioning/#versioning
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