Add missing SciPy dependency to setup.cfg

[gipert]

Closes #38.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (5f5bf78) 60.83% compared to head (fddbcb4) 60.83%.

❗ Current head fddbcb4 differs from pull request most recent head 3dfed10. Consider uploading reports for the commit 3dfed10 to get more accurate results

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #39   +/-   ##
=======================================
  Coverage   60.83%   60.83%           
=======================================
  Files          46       46           
  Lines        2913     2913           
=======================================
  Hits         1772     1772           
  Misses       1141     1141           

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