fix #263: No module named 'pkg_resources'

[jandom]

Just adding setuptools as a dep – will happily refactor in another PR to use importlib?

[codecov[bot]]

Codecov Report

Merging #271 (08c0496) into main (50591ba) will not change coverage. The diff coverage is n/a.

@@           Coverage Diff           @@
##             main     #271   +/-   ##
=======================================
  Coverage   69.20%   69.20%           
=======================================
  Files          22       22           
  Lines        3949     3949           
  Branches      715      715           
=======================================
  Hits         2733     2733           
  Misses       1036     1036           
  Partials      180      180           

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