Add 8.13.1 CHANGELOG-EE entries

Signed-off-by: Rémy Coutable <remy@rymai.me>

CHANGELOG-EE.md

 Please view this file on the master branch, on stable branches it's out of date.
-## 8.13.1
-  - Fix Elasticsearch::Transport::Transport::Errors::BadRequest when ES is enabled. #21036
-  - Hides multiple board actions if user doesnt have permissions
-## 8.13.0 (2016-10-22)
+## 8.14.0 (2016-11-22)
+## 8.13.1 (2016-10-25)
+  - Hide multiple board actions if user doesnt have permissions. !816
+  - Fix Elasticsearch::Transport::Transport::Errors::BadRequest when ES is enabled. !818
+## 8.13.0 (2016-10-22)
   - Cache the last usage data to avoid unicorn timeouts
   - Add user activity table and service to query for active users
   - Fix 500 error updating mirror URLs for projects