I added CHANGELOG.md at the repo root in Keep a Changelog 1.1.0 format. It has the Changelog title, the note that the project follows Keep a Changelog and Semantic Versioning (with links to both), and an ## [Unreleased] section. Under ### Added it lists the --shout, --version and --times N flags (default 1). Nothing has been released, so there is no versioned section. No other files were touched.
I ran both grep checks from the issue and they pass. I didn't check that the links resolve.