Fixed support for ktlint plain reporter

[freemanjp]

Was throwing error Invalid color parameter

Fix: resolves #359

[codecov]

Codecov Report

Merging #376 (d415e7c) into master (877d6e8) will increase coverage by 0.28%.
The diff coverage is 100.00%.

@@             Coverage Diff              @@
##             master     #376      +/-   ##
============================================
+ Coverage     83.55%   83.84%   +0.28%     
  Complexity       81       81              
============================================
  Files            16       16              
  Lines           517      526       +9     
  Branches         72       72              
============================================
+ Hits            432      441       +9     
  Misses           39       39              
  Partials         46       46              

Impacted Files	Coverage Δ	Complexity Δ
...m/github/gantsign/maven/plugin/ktlint/CheckMojo.kt	94.28% <100.00%> (+0.53%)	5.00 <0.00> (ø)
...ven/plugin/ktlint/internal/AbstractCheckSupport.kt	78.81% <100.00%> (+0.36%)	10.00 <0.00> (ø)
...hub/gantsign/maven/plugin/ktlint/internal/Check.kt	100.00% <100.00%> (ø)	4.00 <0.00> (ø)
...ub/gantsign/maven/plugin/ktlint/internal/Report.kt	100.00% <100.00%> (ø)	2.00 <0.00> (ø)

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