[197] Fix statsmodels import issue

[tpvasconcelos]

solves #197

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📚 Documentation preview 📚: https://ridgeplot--198.org.readthedocs.build/en/198/

[codecov-commenter]

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Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 91.02%. Comparing base (e2bf34e) to head (007e912).

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Additional details and impacted files

@@           Coverage Diff           @@
##             main     #198   +/-   ##
=======================================
  Coverage   91.02%   91.02%           
=======================================
  Files          10       10           
  Lines         401      401           
  Branches       70       70           
=======================================
  Hits          365      365           
  Misses         28       28           
  Partials        8        8           

Flag	Coverage Δ
combined-src	90.52% <ø> (ø)

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