horizon 20.0.0 release

meta:version: 20.0.0
meta:diff-start: -
meta:series: xena
meta:release-type: release
meta:pypi: no
meta:first: yes
meta:release:Author: manchandavishal <manchandavishal143@gmail.com>
meta:release:Commit: manchandavishal <manchandavishal143@gmail.com>
meta:release:Change-Id: I392217ea8d18b1347a71b3f782350280b234a3db
meta:release:Code-Review+1: Akihiro Motoki <amotoki@gmail.com>
meta:release:Code-Review+2: Elod Illes <elod.illes@est.tech>
meta:release:Code-Review+1: Itsik Kanias <ikanias@redhat.com>
meta:release:Code-Review+1: Lingxian Kong <anlin.kong@gmail.com>
meta:release:Code-Review+2: Thierry Carrez <thierry@openstack.org>
meta:release:Workflow+1: Thierry Carrez <thierry@openstack.org>
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