Using pull-request descriptions for the auto-generated change-log helps give more flexibility for authors to describe their work. It's possible to embed media i

Using pull-request descriptions for the auto-generated change-log helps give more flexibility for authors to describe their work. It's possible to embed media in the PR description. It' easier to encourage ample description in PR descriptions than commit messages. We often want to leave commits at a finer granularity than features, making it hard to leave a coherent story.