py-daphne: updated to 3.0.1

3.0.1 (2020-11-12)
* Fixed a bug where ``asyncio.CancelledError`` was not correctly handled on
  Python 3.8+, resulting in incorrect protocol application cleanup.

3.0.0 (2020-10-28)
* Updates internals to use ASGI v3 throughout. ``asgiref.compatibility`` is
  used for older applications.
* Consequently, the `--asgi-protocol` command-line option is removed.
* HTTP request bodies are now read, and passed to the application, in chunks.
* Added support for Python 3.9.
* Dropped support for Python 3.5.

(adam)