add test that readme executes

[tlambert03]

No description provided.

[codecov-commenter]

Codecov Report

Merging #7 (c292508) into main (800eb76) will not change coverage.
The diff coverage is n/a.

@@          Coverage Diff          @@
##            main      #7   +/-   ##
=====================================
  Coverage   0.00%   0.00%           
=====================================
  Files          8       8           
  Lines        854     854           
=====================================
  Misses       854     854           

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