Update CHANGELOG.md

Author: stack72

CHANGELOG.md

@@ -89,6 +89,7 @@ IMPROVEMENTS:
  * provider/aws: `delegation_set_id` conflicts w/ `vpc_id` in `aws_route53_zone` as delegation sets can only be used for public zones [GH-7213]
  * provider/aws: Support Elastic Beanstalk scheduledaction [GH-7376]
  * provider/aws: Add support for NewInstancesProtectedFromScaleIn to `aws_autoscaling_group` [GH-6490]
+ * provider/aws: Added support for `snapshot_identifier` parameter in aws_rds_cluster [GH-7158]
  * provider/azurerm: Add support for EnableIPForwarding to `azurerm_network_interface` [GH-6807]
  * provider/azurerm: Add support for exporting the `azurerm_storage_account` access keys [GH-6742]
  * provider/azurerm: The Azure SDK now exposes better error messages [GH-6976]