Update CHANGELOG-EE.md for 11.6.3-ee

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CHANGELOG-EE.md

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+## 11.6.3 (2019-01-04)
+
+### Fixed (1 change)
+
+- Fix instance project templates no longer working. !9019
+
+
 ## 11.6.2 (2019-01-02)
 
 ### Fixed (1 change)

ee/changelogs/unreleased/sh-fix-instance-templates-not-working.yml

----
-title: Fix instance project templates no longer working
-merge_request: 9019
-author:
-type: fixed