oslo.upgradecheck 0.3.1 release

meta:version: 0.3.1
meta:diff-start: -
meta:series: train
meta:release-type: release
meta:pypi: yes
meta:first: no
meta:release:Author: Ben Nemec <bnemec@redhat.com>
meta:release:Commit: Ben Nemec <bnemec@redhat.com>
meta:release:Change-Id: Ie6c4f043ce0f8a6012cd1798bfe883d5b88071f3
meta:release:Code-Review+2: Kendall Nelson <kennelson11@gmail.com>
meta:release:Code-Review+2: Jean-Philippe Evrard <jean-philippe@evrard.me>
meta:release:Code-Review+2: Thierry Carrez <thierry@openstack.org>
meta:release:Workflow+1: Thierry Carrez <thierry@openstack.org>