Dulwich

* Allow adding files to repository in pre-commit hook.
(Jelmer Vernooij, 916)

* Raise SubmoduleEncountered in ``tree_lookup_path``.
(Jelmer Vernooij)

* Support os.PathLike arguments to Repo.stage().
(Jan Wiśniewski, 907)

* Drop support for Python 3.5. (Jelmer Vernooij)

* Add ``dulwich.porcelain._reset_file``.
(Ded_Secer)

* Add ``Repo.unstage``. (Ded_Secer)

* Fix ``dulwich`` script when installed via setup.py.
(Dan Villiom Podlaski Christiansen)

* Make default file mask consistent
with Git. (Dan Villiom Podlaski Christiansen, 884)

* config: disregard UTF-8 BOM when reading file.
(Dan Villiom Podlaski Christiansen)

* Skip lines with spaces only in .gitignore. (Andrey Torsunov, 878)

* Add a separate HTTPProxyUnauthorized exception for 407 errors.
(Jelmer Vernooij, 822)

* Split out a AbstractHTTPGitClient class.
(Jelmer Vernooij)

* Fix installation of GPG during package publishing.
(Ruslan Kuprieiev)

* Prevent removal of refs directory when the last ref is
deleted. (Jelmer Vernooij)

* Fix filename: MERGE_HEADS => MERGE_HEAD.
(Jelmer Vernooij, 861)

* For ignored directories, porcelain.add and porcelain.status now only return
the path to directory itself in the list of ignored paths. Previously, paths
for all files within the directory would also be included in the list.
(Peter Rowlands, 853)

* Provide depth argument to ``determine_wants``.
(Peter Rowlands)

* Various tag signature handling improvements.
(Daniel Murphy)

* Add separate Tag.verify(). (Peter Rowlands)

* Add support for version 3 index files. (Jelmer Vernooij)

* Fix autocrlf=input handling. (Peter Rowlands, Boris Feld)

* Attempt to find C Git global config on Windows.
(Peter Rowlands)

API CHANGES

* The APIs for writing and reading individual index entries have changed
to handle lists of (name, entry) tuples rather than tuples.