Adds automatic PreSignedUrl generation to RDS.StartDBInstanceAutomatedBackupsReplication (#3566)

Author: ajredniwja

lib/services/rds.js

@@ -3,7 +3,7 @@ require('../rds/signer');
  /**
   * @api private
   */
- var crossRegionOperations = ['copyDBSnapshot', 'createDBInstanceReadReplica', 'createDBCluster', 'copyDBClusterSnapshot'];
+ var crossRegionOperations = ['copyDBSnapshot', 'createDBInstanceReadReplica', 'createDBCluster', 'copyDBClusterSnapshot', 'startDBInstanceAutomatedBackupsReplication'];
 
  AWS.util.update(AWS.RDS.prototype, {
    /**