message: swift: Generate classes for subscriptions
diff: @@ -132,6 +132,10 @@ export class SwiftAPIGenerator extends SwiftGenerator<CompilerContext> {
  className = `${this.helpers.operationClassName(operationName)}Mutation`;
  protocol = 'GraphQLMutation';
  break;
  + case 'subscription':
  + className = `${this.helpers.operationClassName(operationName)}Subscription`;
  + protocol = 'GraphQLSubscription';
  + break;
  default:
  throw new GraphQLError(`Unsupported operation type "${operationType}"`);
  }
  