Update tokio-tungstenite requirement from 0.18 to 0.20

[dependabot]

Updates the requirements on tokio-tungstenite to permit the latest version.

Changelog

Sourced from tokio-tungstenite's changelog.

0.20.0

• Change the buffering behavior for Sink::send() and Sink::feed(), see tungstenite's changelog for more details.

0.19.0

• Allow users to enable/disable Nagle algorithm when using connect() helpers.
• Improve the behavior of the Sink for the WebSocketStream, so it does not return an error when it’s not necessary (when poll_flush() is called on a connection that has just been closed).
• Workaround an issue where rustls TLS backend expected domain in a certain format and reject IPv6 addresses if they contained square brackets in them.
• Update dependencies and remove unused errors.

0.18.0

• Update dependencies (underlying tungstenite core).

0.17.2

• Make Origin header case-sensitive (to keep compatibility with poorely-written servers that don't accept lowercase Origin header).
• Make semantics of the reading form the WebSocketStream more reasonable (return None instead of an error when the stream is normally closed).
• Imrpove the way poll_close() works by properly driving the close of the stream till completion.

0.17.1

• Update the tungstenite dependency (fixes a panic in tungstenite and MSRV), see tungstenite's changelog for more details.

0.17.0

• Update the dependencies, please refer to the tungstenite changelog for the actual changes.

0.16.1

• Fix feature selection problem when using TLS.

0.16.0

• Add a function to allow to specify the TLS connector when using connect() like logic.
• Add support for choosing the right root certificates for the TLS.
• Change the behavior of the connect() so that it fails when using TLS without TLS feature.
• Do not project with Unpin.
• Update the dependencies with important implications / improvements.

0.15.0

• Update the tungstenite-rs version to 0.14.0, check tungstenite-rs release for more details.

0.14.0

• Support for rustls as TLS backend.
  • The tls feature was renamed to native-tls and uses a OS-native TLS implementation.

... (truncated)

Commits

• 76b04fe Bump version
• 6d8d11e Merge pull request #287 from alexheretic/poll-flush-pending
• 5dada5d Merge pull request #288 from alexheretic/fix-example-doc
• 5f5a06c tweak doc
• a5e5600 poll_ready: try to flush when !ready
• 4341824 Fix example doc
• f61d93d poll_ready pending after WouldBlock errors
• 36b9d94 Merge pull request #284 from alexheretic/flush-writes-less
• f4dcfec Prepare update to tungstenite 0.20
• 0f485f4 Do not flush on each poll_ready call
• Additional commits viewable in compare view

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[codecov]

Codecov Report

Merging #31 (20d8bff) into main (de8fbc5) will decrease coverage by 0.14%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             main      #31      +/-   ##
==========================================
- Coverage   60.35%   60.22%   -0.14%     
==========================================
  Files          22       20       -2     
  Lines        1072     1071       -1     
==========================================
- Hits          647      645       -2     
- Misses        425      426       +1     

see 3 files with indirect coverage changes

[dependabot]

Looks like tokio-tungstenite is up-to-date now, so this is no longer needed.