Update ChangeLog

Author: ZohebShaikh

CHANGELOG.md

@@ -10,6 +10,7 @@ Write the date in place of the "Unreleased" in the case a new version is release
 - Optional `persist` query parameter to PUT and PATCH /array/... routes, and
   the corresponding DaskArrayClient methods: `write`, `write_block`, `patch`.
 - Added new delete:node and delete:revision scopes
+- Add ExternalPolicyDecision for authorization and an example working with Open Policy Agent 
 
 ### Changed
 
@@ -72,10 +73,6 @@ Write the date in place of the "Unreleased" in the case a new version is release
   `TableSubscription.new_data()` to conveniently access an array
   or table respectively.
 
-### Added
-
-- `locking` key-word argument in HDFAdapter and HDF5Adapter.
-
 ### Fixed
 
 - Prevent exception when serving asset from a node if stat_result already found