Log Message:
py-pygit2: update to 1.1.1.

1.1.1 (2020-03-06)
-------------------------

- Fix crash in tree iteration
  `#984 <https://github.com/libgit2/pygit2/pull/984>`_
  `#980 <https://github.com/libgit2/pygit2/issues/980>`_

- Do not include the docs in dist files, so they're much smaller now