Bump websockets from 3.4 to 9.0.2

[dependabot-preview]

Bumps websockets from 3.4 to 9.0.2.

Changelog

Sourced from websockets's changelog.

9.0.2

May 15, 2021

• Restored compatibility of python -m websockets with Python < 3.9.
• Restored compatibility with mypy.

9.0.1

May 2, 2021

• Fixed issues with the packaging of the 9.0 release.

9.0

May 1, 2021

Version 9.0 moves or deprecates several APIs.

Aliases provide backwards compatibility for all previously public APIs.

• ~datastructures.Headers and ~datastructures.MultipleValuesError were moved from websockets.http to 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.

Version 9.0 may require changes if you use static code analysis tools.

Convenience imports from the websockets module are performed lazily. While this is supported by Python, static code analysis tools such as mypy are unable to understand the behavior.

If you depend on such tools, use the real import path, which can be found in the API documentation:

from websockets.client import connect
from websockets.server import serve

• 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 dict to ~legacy.protocol.WebSocketCommonProtocol.send.
• Fixed sending fragmented, compressed messages.

... (truncated)

Commits

• a14226a Bump version number.
• 8900c13 Add mypy to dictionary.
• 0713dbf Add test coverage.
• b99c4fe Restore real imports for compatibility with mypy.
• e44e085 Use relative imports everywhere, for consistency.
• 70fadbf Restore compatibility with Python < 3.9.
• 217ac2d Fix broken link.
• fc176f4 Bump version number.
• b0d211d Drop Travis CI and Appveyor setup.
• a45cc5a Build distributions on GitHub actions.
• Additional commits viewable in compare view

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