fix: missing semicolon

Signed-off-by: Minsu Lee <[email protected]>

Author: amondnet

modules/openapi-generator/src/main/resources/dart-dio/serializers.mustache

@@ -4,7 +4,7 @@ import 'package:built_value/serializer.dart';
 import 'package:built_collection/built_collection.dart';
 import 'package:built_value/json_object.dart';
 import 'package:built_value/standard_json_plugin.dart';
-{{#timeMachine}}import 'package:{{pubName}}/local_date_serializer.dart{{/timeMachine}}
+{{#timeMachine}}import 'package:{{pubName}}/local_date_serializer.dart';{{/timeMachine}}
 {{#models}}{{#model}}import 'package:{{pubName}}/model/{{classFilename}}.dart';
 {{/model}}{{/models}}