chore: Fix URL to https in docs

Signed-off-by: Austin Ziegler <austin@zieglers.ca>

Author: halostatue

CONTRIBUTING.md

@@ -138,8 +138,7 @@ required metadata trailers are:
 [issues]: https://github.com/mime-types/ruby-mime-types/issues
 [minitest]: https://github.com/seattlerb/minitest
 [mtd]: https://github.com/mime-types/mime-types-data
-[qcm]: http://tbaggery.com/2008/04/19/a-note-about-git-commit-messages.html
 [standardrb]: https://github.com/standardrb/standard
-[tpope-qcm]: http://tbaggery.com/2008/04/19/a-note-about-git-commit-messages.html
+[tpope-qcm]: https://tbaggery.com/2008/04/19/a-note-about-git-commit-messages.html
 [trailers1]: https://git-scm.com/docs/git-interpret-trailers
 [trailers2]: https://git-scm.com/docs/git-commit#Documentation/git-commit.txt---trailerlttokengtltvaluegt