adding class hierarchy

[JesseLivezey]

No description provided.

[codecov]

Codecov Report

Merging #52 into master will increase coverage by 0.11%.
The diff coverage is 86.26%.

@@            Coverage Diff             @@
##           master      #52      +/-   ##
==========================================
+ Coverage   91.26%   91.37%   +0.11%     
==========================================
  Files           6        7       +1     
  Lines        1476     1484       +8     
==========================================
+ Hits         1347     1356       +9     
+ Misses        129      128       -1     

Impacted Files	Coverage Δ
dca/methods_comparison.py	90.61% <60.86%> (+0.61%)	⬆️
dca/dca.py	85.90% <88.23%> (-1.82%)	⬇️
dca/base.py	90.40% <90.40%> (ø)

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