Update CHANGELOG-EE.md for 8.16.2-ee

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CHANGELOG-EE.md

 Please view this file on the master branch, on stable branches it's out of date.
 
+## 8.16.2 (2017-01-25)
+
+- Track Mattermost usage in usage ping. !1071
+- Fix count of required approvals displayed on MR edit form. !1082
+- Fix updating approvals count when editing an MR. !1106
+- Don't try to show assignee in approved_merge_request_email if there's no assignee.
+
 ## 8.16.1 (2017-01-23)
 
 - No changes.

changelogs/unreleased-ee/1078_approval_counts_edit_fix.yml

----
-title: Fix count of required approvals displayed on MR edit form
-merge_request: 1082
-author:

changelogs/unreleased-ee/1591_approvals_update_fix.yml

----
-title: Fix updating approvals count when editing an MR
-merge_request: 1106
-author:

changelogs/unreleased-ee/1601-fix-approved_merge_request_email-when-no-assignee.yml

----
-title: Don't try to show assignee in approved_merge_request_email if there's no assignee
-merge_request:
-author:

changelogs/unreleased-ee/zj-usage-ping-mattermost.yml

----
-title: Track Mattermost usage in usage ping
-merge_request: 1071
-author: