[packages/python-pygit2] Non-fast-forward update to branch master

[draenog]

The branch 'master' was changed in a way that was not a fast-forward update.
NOTE: This may cause problems for people pulling from the branch.

Commits removed from the branch:

  0baa43d... updated to 0.19.1

Commits added to the branch:

  d7128f5... updated to 0.19.1