HISTORY: Prep for 2.2.0 release

v2.1.0

* Prepare ``--commit-msg-filename`` input in the style of
  ``git commit --cleanup=strip`` (Bryan Davis)
* "Footer" references in code and docs changed to "trailer" to match git's own
  naming for structured commit message data. (Bryan Davis)
  (<https://git-scm.com/docs/git-interpret-trailers>). (Bryan Davis)
* T360460: Fix exit status regression in legacy ``commit-message-validator``
  invocation. (Bryan Davis)
* T351253: Allow two trailing spaces after ``Bug: Tnnnn`` and ``Change-Id:
  Ixxxx`` trailers for prettier GitLab markdown rendering support. (Bryan
  Davis)

v2.0.0

* Support "Needed-By:" as a backlink to "Depends-On:" (Daniel Kinzler)
* Alphasort CORRECT_FOOTERS (Sam Reed)
* Convert packaging to hatchling backend (Bryan Davis)
* Introduce RulesMessageValidator (Bryan Davis)
* Add GitLabMessageValidator (Bryan Davis)
* [BREAKING] Add support for checking multiple commits (Bryan Davis)
* Support "Private-Change:" for Puppet Compiler Compiler (John Bond)
* Pre-commit (<https://pre-commit.com/>) plugin support (Bryan Davis)
* [BREAKING] Removed support for self-install as a git hook in favor of
  pre-commit integration. (Bryan Davis)

Release 1.0.0

Release 0.7.0

Release 0.6.0

Release 0.5.2

Release 0.5.1

Release 0.5.0

Release v0.4.1