quadratic feature preprocessing for GLM

[zym1010]

No description provided.

[codecov-io]

Codecov Report

Merging #4 into master will not change coverage.
The diff coverage is 100%.

@@          Coverage Diff          @@
##           master     #4   +/-   ##
=====================================
  Coverage     100%   100%           
=====================================
  Files           3      4    +1     
  Lines         155    190   +35     
  Branches       16     21    +5     
=====================================
+ Hits          155    190   +35

Impacted Files	Coverage Δ
strflab/feature_transformation.py	100% <100%> (ø)

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[coveralls]

Coverage remained the same at 100.0% when pulling 2151c84 on glm into 345fea7 on master.