Update CHANGELOG-EE.md for 11.3.5-ee

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CHANGELOG-EE.md

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+## 11.3.5 (2018-10-15)
+
+### Fixed (1 change)
+
+- Fix epic milestone dates incorrect after issue is linked to another epic. !7809
+
+
 ## 11.3.4 (2018-10-05)
 
 ### Security (1 change)

ee/changelogs/unreleased/7869-update-previous-epic-when-issue-moves-to-new-epic.yml

----
-title: Fix epic milestone dates incorrect after issue is linked to another epic
-merge_request: 7809
-author:
-type: fixed