Fixed document color handler and params

[david-driscoll]

Fixes #381

[codecov]

Codecov Report

Merging #383 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #383   +/-   ##
=======================================
  Coverage   75.75%   75.75%           
=======================================
  Files         561      561           
  Lines       13508    13508           
  Branches     1244     1266   +22     
=======================================
  Hits        10233    10233           
  Misses       3275     3275           

Impacted Files	Coverage Δ
src/Protocol/Document/IDocumentColorHandler.cs	0.00% <ø> (ø)
src/Protocol/Models/DocumentColorParams.cs	0.00% <ø> (ø)

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