>>> import patchwork._version
>>> patchwork._version.__version__
'1.0.1'
>>> import invoke
>>> invoke.__version__
'1.3.0'
>>> import patchwork.files
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/usr/local/lib/python3.8/dist-packages/patchwork/files.py", line 7, in <module>
    from invoke.vendor import six
ImportError: cannot import name 'six' from 'invoke.vendor' (/usr/lib/python3/dist-packages/invoke/vendor/__init__.py)