Update gitpython to 3.1.3

[pyup-bot]

This PR updates gitpython from 3.1.0 to 3.1.3.

Changelog

3.1.3

=====

See the following for details:
https://github.com/gitpython-developers/gitpython/milestone/38?closed=1*

3.1.2

=====

* Re-release of 3.1.1, with known signature

See the following for details:
https://github.com/gitpython-developers/gitpython/milestone/37?closed=1

3.1.1

=====

* support for PyOxidizer, which previously failed due to usage of `__file__`.

See the following for details:
https://github.com/gitpython-developers/gitpython/milestone/36?closed=1

Links

• PyPI: https://pypi.org/project/gitpython
• Changelog: https://pyup.io/changelogs/gitpython/
• Repo: https://github.com/gitpython-developers/GitPython
• Docs: https://pythonhosted.org/GitPython/

[codecov]

Codecov Report

Merging #796 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #796   +/-   ##
=======================================
  Coverage   82.28%   82.28%           
=======================================
  Files          11       11           
  Lines         542      542           
=======================================
  Hits          446      446           
  Misses         96       96           

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