adds entry to changelog

CHANGELOG

@@ -2,6 +2,7 @@ Please view this file on the master branch, on stable branches it's out of date.
 
 v 8.10.0 (unreleased)
   - Expose {should,force}_remove_source_branch (Ben Boeckel)
+  - Fix projects dropdown loading performance with a simplified api cal. !5113 (tiagonbotelho)
   - Fix commit builds API, return all builds for all pipelines for given commit. !4849
   - Replace Haml with Hamlit to make view rendering faster. !3666
   - Expire the branch cache after `git gc` runs