swift 2.13.1 release

meta:version: 2.13.1
meta:diff-start: -
meta:series: ocata
meta:release-type: release
meta:pypi: no
meta:first: no
meta:release:Author: John Dickinson <me@not.mn>
meta:release:Commit: John Dickinson <me@not.mn>
meta:release:Change-Id: Ia39980c48bf1174525ab39d913eec789b574b2d6
meta:release:Code-Review+2: Doug Hellmann <doug@doughellmann.com>
meta:release:Code-Review+2: Alan Pevec <alan.pevec@redhat.com>
meta:release:Workflow+1: Alan Pevec <alan.pevec@redhat.com>
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