Added
- Added conversion between Katakana and Cyrillic scripts.
- Added options for ィ (-y), ゥ (-w) and ㇴ (-n) usage in Latin to Katakana conversion.
- Added support from Python 3.8 and above.
- Added more badges to [README.md](README.md).
- Added [tox](https://tox.readthedocs.io/) for multi-environment testing.