Update CHANGELOG-EE.md for 13.6.2-ee

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CHANGELOG-EE.md

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+## 13.6.2 (2020-12-07)
+
+### Security (1 change)
+
+- Cleanup todos for confidential epics that are no longer accessible by the user.
+
+
 ## 13.6.1 (2020-11-23)
 - No changes.

ee/changelogs/unreleased/security-confepic-todo2.yml

----
-title: Cleanup todos for confidential epics that are no longer accessible by the user
-merge_request:
-author:
-type: security