[tomicapretto]

I was writing code in Bambi to reject interaction terms with these smooths. I realized formulae should reject them.
The reason is all except from bs accept interactions through by. That argument should be added to bs.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 93.02%. Comparing base (20f1098) to head (75cfb13).
⚠️ Report is 18 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #129      +/-   ##
==========================================
+ Coverage   92.47%   93.02%   +0.54%     
==========================================
  Files          20       20              
  Lines        2245     2608     +363     
==========================================
+ Hits         2076     2426     +350     
- Misses        169      182      +13     

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