Update CHANGELOG-EE.md for 13.3.1-ee

[ci skip]

CHANGELOG-EE.md

 Please view this file on the master branch, on stable branches it's out of date.
 
+## 13.3.1 (2020-08-25)
+
+### Fixed (2 changes)
+
+- Geo: Apply selective sync to container repo updates. !39663
+- Geo: Apply selective sync to design repo updates. !39916
+
+
 ## 13.3.0 (2020-08-22)
 
 ### Removed (7 changes)

ee/changelogs/unreleased/mk-apply-selective-sync-to-design-repo-update.yml

----
-title: 'Geo: Apply selective sync to design repo updates'
-merge_request: 39916
-author:
-type: fixed