Bump websockets from 8.1 to 9.0.1

[dependabot]

Bumps websockets from 8.1 to 9.0.1.

Changelog

Sourced from websockets's changelog.

9.0.1 .....

May 2, 2021

• Fixed issues with the packaging of the 9.0 release.

9.0 ...

May 1, 2021

.. note::

**Version 9.0 moves or deprecates several APIs.**
Aliases provide backwards compatibility for all previously public APIs.


:class:~datastructures.Headers and
:exc:~datastructures.MultipleValuesError were moved from
websockets.http to :mod:websockets.datastructures. If you're using
them, you should adjust the import path.


The client, server, protocol, and auth modules were
moved from the websockets package to websockets.legacy
sub-package, as part of an upcoming refactoring. Despite the name,
they're still fully supported. The refactoring should be a transparent
upgrade for most uses when it's available. The legacy implementation
will be preserved according to the backwards-compatibility policy_.


The framing, handshake, headers, http, and uri
modules in the websockets package are deprecated. These modules
provided low-level APIs for reuse by other WebSocket implementations,
but that never happened. Keeping these APIs public makes it more
difficult to improve websockets for no actual benefit.

• Added compatibility with Python 3.9.

• Added support for IRIs in addition to URIs.

• Added close codes 1012, 1013, and 1014.

• Raised an error when passing a :class:dict to :meth:~legacy.protocol.WebSocketCommonProtocol.send.

• Fixed sending fragmented, compressed messages.

• Fixed Host header sent when connecting to an IPv6 address.

• Fixed creating a client or a server with an existing Unix socket.

... (truncated)

Commits

• fc176f4 Bump version number.
• b0d211d Drop Travis CI and Appveyor setup.
• a45cc5a Build distributions on GitHub actions.
• c3d7b7f Change badge in README.
• 3d55449 Drop CircleCI setup.
• cbae1fb Setup GitHub actions.
• 56be5f7 Build wheels on Python 3.9.
• 5d6fcf9 Python 3.9 is now released.
• 5ab214b Bump version number
• 9272873 Work around coverage bug.
• Additional commits viewable in compare view

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[yohanboniface]

@trollfot hey hey, any bandwidth to have a look at this ? Updating websocket from 8 to 9 seems to fail in travis with python > 3.6

[trollfot]

I'll have a look and fix it, no worries

[dependabot]

Superseded by #233.