Update CHANGELOG

[ci skip]

CHANGELOG

@@ -10,16 +10,22 @@ v 8.5.0 (unreleased)
   - Don't vendor minified JS
   - Track project import failure
   - Fix visibility level text in admin area (Zeger-Jan van de Weg)
+  - Update the ExternalIssue regex pattern (Blake Hitchcock)
 
 v 8.4.2 (unreleased)
-  - Fix missing artifacts in build artifacts browser (fixed in Workhorse)
+  - Bump required gitlab-workhorse version to bring in a fix for missing
+    artifacts in the build artifacts browser
+  - Get rid of those ugly borders on the file tree view
+  - Bump gitlab_git version to 7.2.24 in order to bring in a performance
+    improvement when checking if a repository was empty
+  - Add instrumentation for Gitlab::Git::Repository instance methods so we can
+    track them in Performance Monitoring.
 
 v 8.4.1
   - Apply security updates for Rails (4.2.5.1), rails-html-sanitizer (1.0.3),
     and Nokogiri (1.6.7.2)
   - Fix redirect loop during import
   - Fix diff highlighting for all syntax themes
-  - Update the ExternalIssue regex pattern (Blake Hitchcock)
 
 v 8.4.0
   - Allow LDAP users to change their email if it was not set by the LDAP server