D28923: Update links in README.md

[Nathaniel Graham]

ngraham accepted this revision.
This revision is now accepted and ready to land.

REPOSITORY
  R266 Breeze Icons

BRANCH
  readme (branched from master)

REVISION DETAIL
  https://phabricator.kde.org/D28923

To: ndavis, #vdg, ngraham
Cc: alex-l, ngraham, kde-frameworks-devel, LeGast00n, cblack, michaelh, bruns
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