swift 2.16.0 release

meta:version: 2.16.0
meta:diff-start: -
meta:series: queens
meta:release-type: release
meta:pypi: no
meta:first: yes
meta:release:Author: John Dickinson <me@not.mn>
meta:release:Commit: John Dickinson <me@not.mn>
meta:release:Change-Id: If06da86ec4c0c59a8c743fef1708c0b31d1c929a
meta:release:Code-Review+2: Sean McGinnis <sean.mcginnis@gmail.com>
meta:release:Workflow+1: Sean McGinnis <sean.mcginnis@gmail.com>
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