Bump dulwich from 0.19.15 to 0.19.16

[dependabot-preview[bot]]

Bumps dulwich from 0.19.15 to 0.19.16.

Changelog

Sourced from dulwich's changelog.

0.19.16 2020-04-17

• Don't send "deepen None" to server if graph walker supports shallow. (Jelmer Vernooij, #747)

• Support tweaking the compression level for loose objects through the "core.looseCompression" and "core.compression" settings. (Jelmer Vernooij)

• Support tweaking the compression level for pack objects through the "core.packCompression" and "core.compression" settings. (Jelmer Vernooij)

• Add a "dulwich.contrib.diffstat" module. (Kevin Hendricks)

Commits

• c699345 Release 0.19.16
• 03298e9 Move diffstat module to dulwich.contrib, add NEWS item.
• fed1af2 Fix flake8.
• ff06a7f add a simple diffstat implementation
• 5ccb88a We're using Google style docstrings now.
• 1f4fcd7 Fix compatibility with older PackObjectStore subclasses.
• ade4b3b Fix python2 compatibility.
• 2f0b550 Support tweaking pack compression level.
• dac7368 Add compression_level arguments in pack writing functions.
• dd2ca1d Support the looseCompression and compression settings.
• Additional commits viewable in compare view

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[dependabot-preview[bot]]

Superseded by #57.