Prepare changelog for v3.23.0

Author: RiotRobot

CHANGELOG.md

@@ -1,3 +1,11 @@
+Changes in [3.23.0](https://github.com/matrix-org/matrix-react-sdk/releases/tag/v3.23.0) (2021-06-07)
+=====================================================================================================
+[Full Changelog](https://github.com/matrix-org/matrix-react-sdk/compare/v3.23.0-rc.1...v3.23.0)
+
+ * Upgrade to JS SDK 11.2.0
+ * [Release] Fix notif panel timestamp padding
+   [\#6158](https://github.com/matrix-org/matrix-react-sdk/pull/6158)
+
 Changes in [3.23.0-rc.1](https://github.com/matrix-org/matrix-react-sdk/releases/tag/v3.23.0-rc.1) (2021-06-01)
 ===============================================================================================================
 [Full Changelog](https://github.com/matrix-org/matrix-react-sdk/compare/v3.22.0...v3.23.0-rc.1)