Log Message:
py-dulwich: update to 0.20.15

0.20.15	2020-12-23

 * Add some functions for parsing and writing bundles.
   (Jelmer Vernooij)

 * Add ``no_verify`` flag to ``porcelain.commit`` and ``Repo.do_commit``.
   (Peter Rowlands)

 * Remove dependency on external mock module.
   (Matěj Cepl, #820)

0.20.14	2020-11-26

 * Fix some stash functions on Python 3. (Peter Rowlands)

 * Fix handling of relative paths in alternates files on Python 3.
   (Georges Racinet)

0.20.13	2020-11-22

 * Add py.typed to allow type checking. (David Caro)

 * Add tests demonstrating a bug in the walker code.
   (Doug Hellman)

0.20.11	2020-10-30

 * Fix wheels build on Linux. (Ruslan Kuprieiev)

 * Enable wheels build for Python 3.9 on Linux. (Jelmer Vernooij)

0.20.8	2020-10-29

 * Build wheels on Mac OS X / Windows for Python 3.9.
   (Jelmer Vernooij)

0.20.7	2020-10-29

 * Check core.repositoryformatversion. (Jelmer Vernooij, #803)

 * Fix ACK/NACK handling in archive command handling in dulwich.client.
   (DzmitrySudnik, #805)

0.20.6	2020-08-29

 * Add a ``RefsContainer.watch`` interface.
   (Jelmer Vernooij, #751)

 * Fix pushing of new branches from porcelain.push.
   (Jelmer Vernooij, #788)

 * Honor shallows when pushing from a shallow clone.
   (Jelmer Vernooij, #794)

 * Fix porcelain.path_to_tree_path for Python 3.5.
   (Boris Feld, #777)

 * Add support for honor proxy environment variables for HTTP.
   (Aurélien Campéas, #797)

0.20.5	2020-06-22

 * Print a clearer exception when setup.py is executed on Python < 3.5.
   (Jelmer Vernooij, #783)

 * Send an empty pack to clients if they requested objects, even if they
   already have those objects. Thanks to Martijn Pieters for
   the detailed bug report. (Jelmer Vernooij, #781)

 * porcelain.pull: Don't ask for objects that we already have.
   (Jelmer Vernooij, #782)

 * Add LCA implementation. (Kevin Hendricks)

 * Add functionality for finding the merge base. (Kevin Hendricks)

 * Check for diverged branches during push.
   (Jelmer Vernooij, #494)

 * Check for fast-forward during pull. (Jelmer Vernooij, #666)

 * Return a SendPackResult object from
   GitClient.send_pack(). (Jelmer Vernooij)

 * ``GitClient.send_pack`` now sets the ``ref_status`` attribute
   on its return value to a dictionary mapping ref names
   to error messages. Previously, it raised UpdateRefsError
   if any of the refs failed to update.
   (Jelmer Vernooij, #780)

 * Add a ``porcelain.Error`` object that most errors in porcelain
   derive from. (Jelmer Vernooij)

 * Fix argument parsing in dulwich command-line app.
   (Jelmer Vernooij, #784)

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.
   (Brecht Machiels, #7