Dulwich

* 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)

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

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

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

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

* Fix wheels build on Linux. (Ruslan Kuprieiev)

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

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

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

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