Bump dulwich from 0.19.15 to 0.20.3

[dependabot-preview[bot]]

Bumps dulwich from 0.19.15 to 0.20.3.

Changelog

Sourced from dulwich's changelog.

0.20.3 2020-06-14

• Add support for remembering remote refs after push/pull. (Jelmer Vernooij, #752)

• Support passing tree and output encoding to dulwich.patch.unified_diff. (Jelmer Vernooij, #763)

• Fix pushing of new refs over HTTP(S) when there are no new objects to be sent. (Jelmer Vernooij, #739)

• Raise new error HTTPUnauthorized when the server sends back a 401. The client can then retry with credentials. (Jelmer Vernooij, #691)

• Move the guts of bin/dulwich to dulwich.cli, so it is easier to test or import. (Jelmer Vernooij)

• Install dulwich script from entry_points when setuptools is available, making it slightly easier to use on Windows. (Jelmer Vernooij, #540)

• Set python_requires>=3.5 in setup.py. (Manuel Jacob)

0.20.2 2020-06-01

• Brown bag release to fix uploads of Windows wheels.

0.20.1 2020-06-01

• Publish binary wheels for: Windows, Linux, Mac OS X. (Jelmer Vernooij, #711, #710, #629)

0.20.0 2020-06-01

• Drop support for Python 2. (Jelmer Vernooij)

• Only return files from the loose store that look like git objects. (Nicolas Dandrimont)

• Ignore agent= capability if sent by client. (Jelmer Vernooij)

• Don't break when encountering block devices. (Jelmer Vernooij)

• Decode URL paths in HttpGitClient using utf-8 rather than file system encoding. (Manuel Jacob)

• Fix pushing from a shallow clone.

... (truncated)

Commits

• 47b121a Release 0.20.3
• ef06f58 Update NEWS.
• 7ed2c71 Add python_requires metadata to setup.py.
• e297ced Strip newlines in hangup output.
• 41798c3 Add definitions for two more capabilities.
• 1a3a792 Improve error message in HangoutException.
• 95b4c3b Fix use of dulwich.cli.
• 81f4929 Another attempt at fixing type checking on Windows.
• 266be89 Only install SIGQUIT handler when SIGQUIT is available.
• ca5e00b Fix python 3.5 compatibility.
• Additional commits viewable in compare view

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[dependabot-preview[bot]]

Superseded by #64.