Don't string-compare version numbers

[asottile]

Resolves #4306

[asottile]

the py37 job seems pretty sad for this change :S

it passes locally however:

  py37: commands succeeded
  congratulations :)

[RonnyPfannschmidt]

failure is unrelated, i'd prefer if we used or followed up with or used either a recent setuptools version parse or a packaging version parse

[blueyed]

@RonnyPfannschmidt

i'd prefer if we used or followed up with or used either a recent setuptools version parse or a packaging version parse

Please create an issue then.

Altogether I would have liked to see a regression test for this also.