REF: preprocessing module

[martinfleis]

Closes #202

[codecov]

Codecov Report

Merging #214 into master will increase coverage by 0.02%.
The diff coverage is 79.28%.

@@            Coverage Diff             @@
##           master     #214      +/-   ##
==========================================
+ Coverage   92.28%   92.30%   +0.02%     
==========================================
  Files          11       12       +1     
  Lines        2658     2665       +7     
==========================================
+ Hits         2453     2460       +7     
  Misses        205      205              

Impacted Files	Coverage Δ
momepy/preprocessing.py	79.16% <79.16%> (ø)
momepy/__init__.py	100.00% <100.00%> (ø)
momepy/utils.py	99.29% <100.00%> (+14.61%)	⬆️

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