v4.0.0

What's Changed

Two new changes thanks to user @rominf:

1. Repackaged the library to bring it up to modern standards, notably relying on a pyproject.toml file and
   removing support for Python <3.8.
2. When dep, pos, tag, or lemma fields are empty, the underscore _ will be used

New Contributors

• @rominf made their first contribution in #32

Full Changelog: v3.4.0...v4.0.0