Update CHANGELOG-EE.md for 11.9.1-ee

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CHANGELOG-EE.md

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+## 11.9.1 (2019-03-25)
+
+### Fixed (1 change)
+
+- Fix date save for Epic to reflect on UI immediately after save. !10321
+
+
 ## 11.9.0 (2019-03-22)
 
 ### Security (4 changes)

ee/changelogs/unreleased/10543-fix-epic-date-save.yml

----
-title: Fix date save for Epic to reflect on UI immediately after save
-merge_request: 10321
-author:
-type: fixed