Releases.md

-## release 0.20
+## release 0.21 (M18)
+
+### Bug Fixes
+
+- Werkzeug upgrade to 2.2.3
+- Enabled the refreshing of token in case of expired token instead of throwing exception
+- Dk/az refresh logic
+- Create version file in build pipeline
+
+### Features
+
+- Implemented checksum upload and validation for cp/stat operations
+
+### Miscellaneous Tasks
+
+- Create Release Branch for version 0.21
+- Updating NOTICE
+
+## release 0.20 (M17)
 
 ### Miscellaneous Tasks