Add plot column utility method

[katxiao]

[codecov-commenter]

Codecov Report

Merging #201 (94cd273) into master (ac0edda) will increase coverage by 0.34%. The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #201      +/-   ##
==========================================
+ Coverage   63.78%   64.13%   +0.34%     
==========================================
  Files          65       67       +2     
  Lines        2060     2080      +20     
==========================================
+ Hits         1314     1334      +20     
  Misses        746      746              

Impacted Files	Coverage Δ
sdmetrics/reports/__init__.py	100.00% <100.00%> (ø)
sdmetrics/reports/utils.py	100.00% <100.00%> (ø)

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