setup: require argparse if py < 3.2

[efiop]

Fixes #5

[codecov-commenter]

Codecov Report

Merging #6 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master       #6   +/-   ##
=======================================
  Coverage   73.64%   73.64%           
=======================================
  Files           2        2           
  Lines         148      148           
=======================================
  Hits          109      109           
  Misses         39       39           

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