Log Message:
py-pygit2: Update to 1.3.0.

Includes a build fix for the updated libgit2 1.1.x, figured it may as well
be updated at the same time.

1.3.0 (2020-09-18)
-------------------------

- New ``Repository.add_submodule(...)``
  `#1011 <https://github.com/libgit2/pygit2/pull/1011>`_

- New ``Repository.applies(...)``
  `#1019 <https://github.com/libgit2/pygit2/pull/1019>`_

- New ``Repository.revparse(...)`` and ``Repository.revparse_ext(...)``
  `#1022 <https://github.com/libgit2/pygit2/pull/1022>`_

- New optional ``flags`` and ``file_flags`` arguments in
  ``Repository.merge_commits`` and ``Repository.merge_trees``
  `#1008 <https://github.com/libgit2/pygit2/pull/1008>`_

- New ``Reference.raw_target``, ``Repository.raw_listall_branches(...)`` and
  ``Repository.raw_listall_references()``; allow bytes in
  ``Repository.lookup_branch(...)`` and ``Repository.diff(...)``
  `#1029 <https://github.com/libgit2/pygit2/pull/1029>`_

- New ``GIT_BLAME_FIRST_PARENT`` and ``GIT_BLAME_USE_MAILMAP`` constants
  `#1031 <https://github.com/libgit2/pygit2/pull/1031>`_

- New ``IndexEntry`` supports ``repr()``, ``str()``, ``==`` and ``!=``
  `#1009 <https://github.com/libgit2/pygit2/pull/1009>`_

- New ``Object`` supports ``repr()``
  `#1022 <https://github.com/libgit2/pygit2/pull/1022>`_

- New accept tuples of strings (not only lists) in a number of places
  `#1025 <https://github.com/libgit2/pygit2/pull/1025>`_

- Fix compatibility with old macOS 10.9
  `#1026 <https://github.com/libgit2/pygit2/issues/1026>`_
  `#1027 <https://github.com/libgit2/pygit2/pull/1027>`_

- Fix check argument type in ``Repository.apply(...)``
  `#1033 <https://github.com/libgit2/pygit2/issues/1033>`_

- Fix raise exception if error in ``Repository.listall_submodules()`` commit 32133974

- Fix a couple of refcount errors in ``OdbBackend.refresh()`` and
  ``Worktree_is_prunable`` commit fed0c19c

- Unit tests
  `#800 <https://github.com/libgit2/pygit2/issues/800>`_
  `#1015 <https://github.com/libgit2/pygit2/pull/1015>`_

- Documentation
  `#705 <https://github.com/libgit2/pygit2/pull/705>`_