code: function(arn, name, value) {
          var params = {
              AttributeName: name,
              AttributeValue: value,
              TopicArn: arn
          };
  
          return this.svc.setTopicAttributes(params);
      }
docs: updates the attributes for the specified topic.  only a few of the attributes can be updated, those
  being: Policy, DisplayName, and DeliveryPolicy
  
  @param {String} arn the TopicArn of the target topic
  @param {String} name the name of the attribute to update
  @param {String} value the value of the attribute to update