Update CHANGELOG-EE.md for 12.9.2-ee

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CHANGELOG-EE.md

 Please view this file on the master branch, on stable branches it's out of date.
 
+## 12.9.2 (2020-03-31)
+
+### Fixed (4 changes)
+
+- Fix direct access to individual design on deprecated issue route. !27650
+- Fix error when viewing events from design notes on project activity page. !27840
+- Allow Seat Link to be disabled through configuration or admin toggle. !28015
+- Allow active_users param to be optional for SyncSeatLinkRequestWorker#perform. !28241
+
+### Changed (1 change)
+
+- Send active users for each day in seat link POST request. !27481
+
+
 ## 12.9.1 (2020-03-26)
 
 ### Security (1 change)

ee/changelogs/unreleased/211833-fix-direct-access-to-deprecated-design-path.yml

----
-title: Fix direct access to individual design on deprecated issue route
-merge_request: 27650
-author:
-type: fixed

ee/changelogs/unreleased/212375-seat-link-admin-toggle.yml

----
-title: Allow Seat Link to be disabled through configuration or admin toggle
-merge_request: 28015
-author:
-type: fixed

ee/changelogs/unreleased/ajk-fix-design-activity.yml

----
-title: Fix error when viewing events from design notes on project activity page
-merge_request: 27840
-author:
-type: fixed

ee/changelogs/unreleased/send-active-users-in-seat-link.yml

----
-title: Send active users for each day in seat link POST request
-merge_request: 27481
-author:
-type: changed

ee/changelogs/unreleased/ta-fix-sync-seat-link-worker-parameter.yml

----
-title: Allow active_users param to be optional for SyncSeatLinkRequestWorker#perform
-merge_request: 28241
-author:
-type: fixed