Update CHANGELOG-EE.md for 11.7.5-ee

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CHANGELOG-EE.md

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+## 11.7.5 (2019-02-05)
+
+### Fixed (2 changes)
+
+- Fix Kerberos authentication. !9390
+- Fix background migration error when project repository is missing. !9392
+
+
 ## 11.7.2 (2019-01-29)
 
 ### Security (6 changes)

ee/changelogs/unreleased/1979-blobs-at.yml

----
-title: Fix background migration error when project repository is missing
-merge_request: 9392
-author:
-type: fixed

ee/changelogs/unreleased/9519-kerberos-spnego-authentication-is-broken-since-a-code-refactoring.yml

----
-title: Fix Kerberos authentication
-merge_request: 9390
-author:
-type: fixed