Changelog contains an entry for every commit in a PR

In [this release](https://github.com/dandi/dandi-cli/releases/tag/0.11.0) made moments ago with the latest release of `auto` (currently 10.18.3), you can see that there are multiple items under "Enhancement" associated with PR 330, with each item being the commit message for a commit in that PR. This is unlike the rest of the changelog, which only has one item per PR regardless of how many commits were made.