Release 4.15.0 (#194)
Release 4.15.0 (#194)

* Updated changelog and package.json for 4.15.0 release

* Apply suggestions from code review

Co-authored-by: John Lyons <ccdf991c5bb9582918d954f6f7ebf5e3ee6e9738@blackbaud.com>

Co-authored-by: John Lyons <ccdf991c5bb9582918d954f6f7ebf5e3ee6e9738@blackbaud.com>
blackbaud/skyux,blackbaud/skyux,blackbaud/skyux