Histogram tweaks

[heckj]

No description provided.

[codecov]

Codecov Report

Merging #47 (73e1f3b) into main (74b2e33) will increase coverage by 0.04%.
The diff coverage is 88.88%.

@@            Coverage Diff             @@
##             main      #47      +/-   ##
==========================================
+ Coverage   88.02%   88.06%   +0.04%     
==========================================
  Files          37       37              
  Lines        2723     2791      +68     
==========================================
+ Hits         2397     2458      +61     
- Misses        326      333       +7     

Impacted Files	Coverage Δ
Sources/SwiftVizScale/Histogram/Histogram.swift	92.04% <83.01%> (-2.81%)	⬇️
.../SwiftVizScaleTests/Histogram/HistogramTests.swift	100.00% <100.00%> (ø)

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