Update changelog

CHANGELOG

@@ -85,6 +85,7 @@ v 8.7.0 (unreleased)
   - Fix: Allow empty recipients list for builds emails service when pushed is added (Frank Groeneveld)
   - Improved markdown forms
   - Delete tags using Rugged for performance reasons (Robert Schilling)
+  - Add Slack notifications when Wiki is edited (Sebastian Klier)
   - Diffs load at the correct point when linking from from number
   - Selected diff rows highlight
   - Fix emoji categories in the emoji picker
@@ -124,7 +125,6 @@ v 8.6.5
   - Return status code 303 after a branch DELETE operation to avoid project deletion (Stan Hu). !3583
   - Unblock user when active_directory is disabled and it can be found !3550
   - Fix a 2FA authentication spoofing vulnerability.
-  - Add Slack notifications when Wiki is edited (Sebastian Klier)
 
 v 8.6.4
   - Don't attempt to fetch any tags from a forked repo (Stan Hu)