Update CHANGELOG-EE.md for 10.7.4-ee

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CHANGELOG-EE.md

 Please view this file on the master branch, on stable branches it's out of date.
 
+## 10.7.4 (2018-05-21)
+
+### Fixed (2 changes)
+
+- Does not log failed sign-in attempts when in a GitLab read-only instance. !5643
+- Fix: Geo: BaseSyncService should prune the @geo-temporary directory before fetching.
+
+
 ## 10.7.3 (2018-05-02)
 
 ### Fixed (3 changes)

ee/changelogs/unreleased/5841-geo-basesyncservice-should-prune-the-geo-temporary-directory-before-fetching.yml

----
-title: 'Fix: Geo: BaseSyncService should prune the @geo-temporary directory before
-  fetching'
-merge_request:
-author:
-type: fixed

ee/changelogs/unreleased/5957-geo-secondary-can-t-log-failed-sign-in-attempts-due-to-read-only-db.yml

----
-title: Does not log failed sign-in attempts when in a GitLab read-only instance
-merge_request: 5643
-author:
-type: fixed