Compare ColumnReference by intValue

[MaxDesiatov]

Resolve #137

[codecov]

Codecov Report

Merging #139 (5f36eea) into main (dffe14a) will not change coverage.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##             main     #139   +/-   ##
=======================================
  Coverage   97.05%   97.05%           
=======================================
  Files           9        9           
  Lines         306      306           
=======================================
  Hits          297      297           
  Misses          9        9           

Impacted Files	Coverage Δ
Sources/CoreXLSX/Worksheet/ColumnReference.swift	100.00% <100.00%> (ø)

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