GitPython: remove or update?

[mathjazz]

GitPython module version required by funfactory and install in vendor/ is quite old:
https://github.com/mozilla/funfactory/blob/master/funfactory/requirements/prod.txt
https://github.com/mozilla/playdoh-lib/tree/master/lib/python/git
https://pythonhosted.org/GitPython/0.3.2/changes.html

Do we even need it? If yes, can we update it?

[fwenzel]

I don't think we do need it anymore actually.

[willkg]

Pretty sure it's a requirement for jingo-minify.