Log Message:
py-fastimport: updated to 0.9.12

0.9.12  2021-05-02

0.9.11  2021-04-12

0.9.10  2021-04-11
* Declare python 3.5 requirement in setup.py.

0.9.9   2021-04-10
* Drop various other python2 helpers, test on newer versions of Python.