Add changelog entry for ATP and ADW wallet support

Author: kilokahn

CHANGELOG.md

@@ -5,6 +5,7 @@
 - Support for object lifecycle policies on a bucket on object storage. See [Using Object Lifecycle Management](https://docs.cloud.oracle.com/iaas/Content/Object/Tasks/usinglifecyclepolicies.htm)
 - Support for singular data source for a bucket
 - Additional nested field in `oci_database_backups` data source and `oci_database_backup` resource, under the `backups` property called `database_size_in_gbs`
+- Support for generating and downloading wallets for Autonomous Database and Autonomous Data Warehouse. See [Connecting to Autonomous Data Warehouse](https://docs.cloud.oracle.com/iaas/Content/Database/Tasks/adwconnecting.htm) for more details.
 
 ### Changed
 - Nested field in `oci_database_backups` data source and `oci_database_backup` resource, under the `backups` property called `db_data_size_in_mbs` marked as deprecated