Update CHANGELOG.md for 11.4.9

[ci skip]

CHANGELOG.md

@@ -287,6 +287,14 @@ entry.
 - Disables stop environment button while the deploy is in progress.
 
 
+## 11.4.9 (2018-12-03)
+
+### Fixed (2 changes)
+
+- Display impersonation token value only after creation. !22916
+- Correctly handle data-loss scenarios when encrypting columns. !23306
+
+
 ## 11.4.8 (2018-11-27)
 
 ### Security (24 changes)

changelogs/unreleased/53763-fix-encrypt-columns-data-loss.yml

----
-title: Correctly handle data-loss scenarios when encrypting columns
-merge_request: 23306
-author:
-type: fixed

changelogs/unreleased/ce-53347_fix_impersonation_tokens.yml

----
-title: Display impersonation token value only after creation
-merge_request: 22916
-author:
-type: fixed