Contrib > Disable transparency slider

[Blackbaud-SteveBrush]

Issue: https://github.com/blackbaud/skyux-colorpicker/issues/18

Original contribution: #19

[codecov]

Codecov Report

Merging #20 into master will not change coverage.
The diff coverage is 100%.

@@          Coverage Diff          @@
##           master    #20   +/-   ##
=====================================
  Coverage     100%   100%           
=====================================
  Files          10     10           
  Lines         500    502    +2     
  Branches       49     49           
=====================================
+ Hits          500    502    +2

Impacted Files	Coverage Δ
...ublic/modules/colorpicker/colorpicker.component.ts	100% <100%> (ø)	⬆️
...modules/colorpicker/colorpicker-input.directive.ts	100% <100%> (ø)	⬆️

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