Update CHANGELOG-EE.md for 13.2.7-ee

[ci skip]

CHANGELOG-EE.md

@@ -262,6 +262,14 @@ Please view this file on the master branch, on stable branches it's out of date.
 - Replace -800 hex value, replace usages with -700. !39734
+## 13.2.7 (2020-09-02)
+
+### Security (2 changes)
+
+- Sanitize vulnerability history comment.
+- Fix displaying epics visibility in issue sidebar.
+
+
 ## 13.2.6 (2020-08-18)
 - No changes.