This is a feature request to make Librarian CLI responsible for generating and updating the CHANGELOG.md file for each library.

Librarian will use the same commit information that is used to generate the GitHub release notes to create or update the CHANGELOG.md file.

This way language containers will not have to implement changlog updates, and the changelog files will be consistent for all languages.

An example implementation in Go container can be referenced.

cc: @jskeet @ldetmer @codyoss