Test failure with websockets > 9

[fabaff]

The tests don't pass with websockets-10.0:

$ poetry run pytest
ImportError while loading conftest '/home/fab/Documents/repos/pytest-sanic/tests/conftest.py'.
tests/conftest.py:7: in <module>
    from sanic.websocket import WebSocketProtocol
E   ModuleNotFoundError: No module named 'sanic.websocket'

Works fine with websockets-9.

Distributions are starting to ship websockets-10 which could lead to failures when running the tests during the package build processes.

Thanks

[yunstanford]

doesn't seem it's related to the version bump, guess sanic removes that module in recent version, can take a look tho