Set the version to 2.3.3 and add release notes.

Write release notes for 2.3.2.

Edited updates now submit builds to the pending_signing_tag.

fixes fedora-infra#1067

Write release notes for 2.3.0.

Document fedora-infra#994 in the release notes.

re fedora-infra#994

Write release notes for 2.2.3.

Write 2.2.2 release notes and set the version.

Set the version to 2.2.1 in the setup.py and docs.conf.py.

Merge pull request fedora-infra#924 from bowlofeggs/docs-2.2.0_changelog

Write release notes for the upcoming 2.2.0 release.