fix(parsetohsl): fixes support for 4 space-separated CSS values

[bhough]

fix #605

[codecov]

Codecov Report

Merging #606 (9f90463) into main (bf2bd28) will not change coverage.
The diff coverage is 100.00%.

@@            Coverage Diff            @@
##              main      #606   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           89        89           
  Lines          856       856           
  Branches       319       319           
=========================================
  Hits           856       856           

Flag	Coverage Δ
unittests	100.00% <100.00%> (ø)

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Impacted Files	Coverage Δ
src/color/transparentize.js	100.00% <ø> (ø)
src/color/parseToRgb.js	100.00% <100.00%> (ø)

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