The f-droid app currently only shows, what is new in the last version. I think, it is more useful to show the accumulated changes until the current installed version. E.g. I am on versionCode 6 and the new version is 9, then only the changes for version 9 are shown. To show all new features/fixes, the changes for version 7, 8 and 9 should be shown. This change does not make sense for the website, but the app has the version information for the current installed app.