Fix #90

Author: ThexXTURBOXx

lib/src/generator/templates.dart

@@ -6,6 +6,7 @@ String generateL10nDartFileContent(
     [bool otaEnabled = false]) {
   return """
 // GENERATED CODE - DO NOT MODIFY BY HAND
+import 'package:flutter/foundation.dart';
 import 'package:flutter/material.dart';
 import 'package:intl/intl.dart';${otaEnabled ? '\n${_generateLocalizelySdkImport()}' : ''}
 import 'intl/messages_all.dart';
@@ -29,7 +30,7 @@ class $className {
     final name = (locale.countryCode?.isEmpty ?? false) ? locale.languageCode : locale.toString();
     final localeName = Intl.canonicalizedLocale(name);${otaEnabled ? '\n${_generateMetadataSetter()}' : ''} 
     return initializeMessages(localeName).then((_) {
-      return $className(localeName);
+      return SynchronousFuture<$className>($className(localeName));
     });
   }