Fix changelog.

CHANGELOG

@@ -74,6 +74,7 @@ v 7.9.0 (unreleased)
   - Raise recommended number of unicorn workers from 2 to 3
   - Use same layout and interactivity for project members as group members.
   - Prevent gitlab-shell character encoding issues by receiving its changes as raw data.
+  - Fix invalid Atom feeds when using emoji, horizontal rules, or images (Christian Walther)
 
 v 7.8.4
   - Fix issue_tracker_id substitution in custom issue trackers
@@ -101,9 +102,6 @@ v 7.8.1
   - Fix urls for the issues when relative url was enabled
 
 v 7.8.0
-  - Fix invalid Atom feeds when using emoji, horizontal rules, or images (Christian Walther)
-
-v 7.8.0 (unreleased)
   - Fix access control and protection against XSS for note attachments and other uploads.
   - Replace highlight.js with rouge-fork rugments (Stefan Tatschner)
   - Make project search case insensitive (Hannes Rosenögger)