- Renamed `mask` variable in ABNF to prevent name collision with `mask()` function (9b51f73)
- Fixed old http import of HTTPStatus in _handshake.py (9b51f73)
- Add `send_text()` and `send_bytes()` to _app.py (953)
- Improved typehint support (953, 9b51f73, 8b73d00)
- General readability improvements, made all string concatenations use f-strings (909, 780584f, 3eabc6e)
- Applied black formatting style to code (da7f286)