updated changelog

Author: Sambit Rath

src/RecoveryServices/RecoveryServices/ChangeLog.md

@@ -18,6 +18,7 @@
         - Additional information about change #1
 -->
 ## Upcoming Release
+* Azure Backup added support for adding tags while creating a Recovery Services Vault.
 
 ## Version 2.4.0
 * Azure Site Recovery change support for managed disk vms encrypted at rest with customer managed leys for Azure to Azure provider.