Update CHANGELOG-EE.md for 10.7.3-ee

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CHANGELOG-EE.md

 Please view this file on the master branch, on stable branches it's out of date.
 
+## 10.7.3 (2018-05-02)
+
+### Fixed (3 changes)
+
+- Geo - Fix undefined method pending_delete for nil class. !5470
+- Geo: Admin page will not crash with 500 because of InvalidSignatureTimeError. !5495
+- Fix DB LB errors when escaping input.
+
+
 ## 10.7.2 (2018-04-25)
 
 - No changes.

ee/changelogs/unreleased/5751-geo-undefined-method-pending_delete-for-nil-nilclass.yml

----
-title: Geo - Fix undefined method pending_delete for nil class
-merge_request: 5470
-author:
-type: fixed

ee/changelogs/unreleased/5796-fix-invalid-signature-time-error.yml

----
-title: 'Geo: Admin page will not crash with 500 because of InvalidSignatureTimeError'
-merge_request: 5495
-author:
-type: fixed

ee/changelogs/unreleased/load-balancing-connection-quoting.yml

----
-title: Fix DB LB errors when escaping input
-merge_request:
-author:
-type: fixed