[NO-ISSUE] Add changelog entry for #580

changelog.d/580

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+synopsis: Show last upload or revision date in packsge listings
+prs: #580

changelog.d/config

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+-- Possible fields for changelog entry
+-- synopsis: Brief description of the change. Often just the PR title.
+-- description:	Longer description, with a list of sub-changes. Not needed for small/atomic changes.
+-- packages: Packages affected by the change. Omit if it's an overarching or non-package change.
+-- prs: Space-separated hash-prefixed pull request numbers containing the change (usually just one).
+-- issues: Space-separated hash-prefixed issue numbers that the change fixes/closes/affects.
+-- significance: Set to significant if the change is significant, that is if it warrants being put near the top of the changelog.
+
 organization: flora-pm
 repository: flora-server
 issue-url-template: https://github.com/{organization}/{repository}/issue/{index}