Update CHANGELOG.md for 11.5.2

[ci skip]

CHANGELOG.md

@@ -2,6 +2,22 @@
 documentation](doc/development/changelog.md) for instructions on adding your own
 entry.
 
+## 11.5.2 (2018-12-03)
+
+### Removed (1 change)
+
+- Removed Site Statistics optimization as it was causing problems. !23314
+
+### Fixed (6 changes, 1 of them is from the community)
+
+- Display impersonation token value only after creation. !22916
+- Fix not render emoji in filter dropdown. !23112 (Hiroyuki Sato)
+- Fixes stuck tooltip on stop env button. !23244
+- Correctly handle data-loss scenarios when encrypting columns. !23306
+- Clear BatchLoader context between Sidekiq jobs. !23308
+- Fix handling of filenames with hash characters in tree view. !23368
+
+
 ## 11.5.1 (2018-11-26)
 
 ### Security (17 changes)

changelogs/unreleased/53778-remove-site-statistics.yml

----
-title: Removed Site Statistics optimization as it was causing problems
-merge_request: 23314
-author:
-type: removed

changelogs/unreleased/54282-tooltip-stuck.yml

----
-title: Fixes stuck tooltip on stop env button
-merge_request: 23244
-author:
-type: fixed

changelogs/unreleased/dm-batch-loader-sidekiq.yml

----
-title: Clear BatchLoader context between Sidekiq jobs
-merge_request: 23308
-author:
-type: fixed

changelogs/unreleased/fix-not-render-emoji.yml

----
-title: Fix not render emoji in filter dropdown
-merge_request: 23112
-author: Hiroyuki Sato
-type: fixed

changelogs/unreleased/sh-fix-hash-filename-handling.yml

----
-title: Fix handling of filenames with hash characters in tree view
-merge_request: 23368
-author:
-type: fixed