Add Changelog entry for improvements in builds artifacts browser

CHANGELOG

@@ -62,10 +62,11 @@ v 8.4.0 (unreleased)
   - Add reporters ability to download and browse build artifacts (Andrew Johnson)
   - Autofill referring url in message box when reporting user abuse. (Josh Frye)
   - Remove leading comma on award emoji when the user is the first to award the emoji (Zeger-Jan van de Weg)
+  - Add build artifacts browser
+  - Improve UX in builds artifacts browser
 v 8.3.4
   - Use gitlab-workhorse 0.5.4 (fixes API routing bug)
-  - Add build artifacts browser
 v 8.3.3
   - Preserve CE behavior with JIRA integration by only calling API if URL is set