PatchYAML looks for the proper place to add the new revision in the changelog, trying to conserve original format and comments.

ReadChangelog reads and parses the given package changelog file.

ReadChangelogFromPackageRoot reads and parses the package changelog file for the given package.

PackageChangelogFile is the name of the package's changelog file.

Entry represents an entry in a package changelog.yml file.

Revision represents an version in a package changelog.yml file.