chore: update README

README.md

@@ -21,6 +21,37 @@ You can see live demo of CloudBeaver here: https://demo.cloudbeaver.io
 [Database access instructions](https://github.com/dbeaver/cloudbeaver/wiki/Demo-Server)
 
 ## Changelog
+
+### CloudBeaver 21.3.0 - 2021-12-24
+
+Changes since 21.2.0
+- Data Editor:
+  - Table rows can be duplicated.
+  - Hotkeys are added for table editing.
+  - Confirmation is required to close or refresh a table with unsaved changes.
+  - XML values can be edited.
+- SQL Editor:
+  - SQL formatting is available.
+  - Scripts can be downloaded and uploaded.
+  - The SQL Editor can be opened in a separate browser tab.
+- Metadata Editor:
+  - Objects DDL can be saved to an external file.
+- Administration:
+  - Instructions to update the CloudBeaver version are available for administrators.
+  - The server easy configuration is simplified.
+  - Deleting of roles with assigned users is prohibited.
+- Local configuration:
+  - The following limits can be set:
+    - the size of exported files,
+    - the number of fetched table rows,
+    - the number of executable queries at the same time.
+  - The possibility to edit database objects can be disabled.
+  - User access information can be stored in a local database.
+- The current user information is available in the Profile at the top menu.
+- Chinese UI localization is supported. 
+- DB2 iSeries driver is added.
+- A lot of small bug fixes, enhancements and improvements have been made.
+
 ### CloudBeaver 21.2.4 - 2021-12-09
 - SQL formatting is available in the SQL Editor.
 - Confirmation is required to refresh a table with unsaved changes.