Please add a "changelog link" field to the database
Currently, it is very difficult to find out what's new in updated apps before installing: sometimes fortunately the app descriptions contain a link to a changelog file, but more often one has to go searching for the changelog in the app's source repository.
If there were a standard database entry containing a changelog link (like the links to website, source code, and issue tracker), app maintainers would be reminded to fill this in.
(The Google Play store does this right.)