Bump twisted from 17.9.0 to 20.3.0

[dependabot]

Bumps twisted from 17.9.0 to 20.3.0.

Changelog

Sourced from twisted's changelog.

Twisted 20.3.0 (2020-03-13)

Bugfixes

• twisted.protocols.amp.BoxDispatcher.callRemote and callRemoteString will no longer return failing Deferreds for requiresAnswer=False commands when the transport they're operating on has been disconnected. (#9756)

Improved Documentation

• Added a missing hyphen to a reference to the --debug option of pdb in the Trial how-to. (#9690)
• The documentation of the twisted.cred.checkers module has been extended and corrected. (#9724)

Deprecations and Removals

• twisted.news is deprecated. (#9405)

Misc

• #9634, #9701, #9707, #9710, #9715, #9726, #9727, #9728, #9729, #9735, #9737, #9757

Conch

Features

- twisted.conch.ssh now supports the curve25519-sha256 key exchange algorithm (requires OpenSSL >= 1.1.0). ([#6814](https://github.com/twisted/twisted/issues/6814))
- twisted.conch.ssh.keys can now write private keys in the new "openssh-key-v1" format, introduced in OpenSSH 6.5 and made the default in OpenSSH 7.8.  ckeygen has a corresponding new --private-key-subtype=v1 option. ([#9683](https://github.com/twisted/twisted/issues/9683))
Bugfixes

• twisted.conch.keys.Key.privateBlob now returns the correct blob format for ECDSA (i.e. the same as that implemented by OpenSSH). (#9682)

Misc

- [#9760](https://github.com/twisted/twisted/issues/9760)
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Commits

• 121c98e Merge branch 'release-20.3-9772' of github.com:twisted/twisted into release-2...
• b9f8dad Fix a lint error in copyright.py and a release process bug that doesn't consi...
• 384de59 towncrier for 20.3.0
• 35db7f1 incremental 20.3.0
• 0ebf7c5 Revert "20.3rc1 towncrier"
• 50412c9 20.3rc1 towncrier
• f80bdfa Fix a newsfile
• 420f17a 20.3rc1
• 5bab6b3 it's a brand new year, the sun is high, the birds are singin that 2019 went a...
• 20c787a Merge pull request from GHSA-8r99-h8j2-rw64
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[dependabot]

Superseded by #23.