Update CHANGELOG

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CHANGELOG

@@ -5,6 +5,8 @@ v 8.5.0 (unreleased)
   - Ignore binary files in code search to prevent Error 500 (Stan Hu)
   - Upgrade gitlab_git to 7.2.23 to fix commit message mentions in first branch push
   - New UI for pagination
+  - Don't prevent sign out when 2FA enforcement is enabled and user hasn't yet
+    set it up
   - Fix diff comments loaded by AJAX to load comment with diff in discussion tab
   - Whitelist raw "abbr" elements when parsing Markdown (Benedict Etzel)