update address

bin/main.dart

@@ -22,6 +22,6 @@ void main() async {
       .addHandler(router.call);
 
   // Start the server
-  final server = await shelf_io.serve(handler, 'localhost', 8080);
+  final server = await shelf_io.serve(handler, '0.0.0.0', 8080);
   print('Server listening on port ${server.port}');
 }