D27192: [KColorUtils] Change getHcy() hue range to [0.0, 1.0)

[Noah Davis]

ndavis added a reviewer: mwoehlke.

REPOSITORY
  R273 KGuiAddons

REVISION DETAIL
  https://phabricator.kde.org/D27192

To: ndavis, #frameworks, dfaure, mwoehlke
Cc: kde-frameworks-devel, mwoehlke, LeGast00n, GB_2, michaelh, ngraham, bruns