0.33.1 — Ship the changelog in the package

Fixed

• CHANGELOG.md now ships in the published package. The files allowlist in
  package.json omitted it, and npm only auto-includes package.json / README /
  LICENSE on top of an allowlist, so every tarball through 0.33.0 shipped without a
  changelog. Added it to files. Consumer tooling that diffs changelogs across versions
  could not see one before this.