Merge pull request velero-io#153 from ncdc/make-release

Add 'make release'

Merge pull request velero-io#91 from ncdc/tag-v0.4.0

Bump to v0.4.0

v0.3.3

* Fix a bug where the schedule's cron expression was parsing the first
field as seconds instead of minutes

Add client-go auth provider plugins for Azure, GCP, OIDC

Minor fixes to Makefile and changelog

v0.3.0: Initial release