* Allow adding or removing words without selecting them first
* Better mypy config
* Fix deprecation warnings with latest `path.py` version
* Rewrite plugin so we don't depend on `lint.kak` at all
* Replace `lint-on-save` with a proper hook
Breaking changes
* `kak-spell` no longer creates the `<lang>` option and no longer takes
a language as first argument, instead you should run `kak-spell-enable <lang>` before calling `kak-spell`
* Rename `kak-spell-clear` to `kak-spell-disable`