Update CHANGELOG-EE.md for 13.0.13-ee

[ci skip]

CHANGELOG-EE.md

@@ -576,6 +576,10 @@ Please view this file on the master branch, on stable branches it's out of date.
 - Relocate Go models. !34338 (Ethan Reesor (@firelizzard))
+## 13.0.13 (2020-08-17)
+
+- No changes.
+
 ## 13.0.12 (2020-08-05)
 - No changes.