[bootstrap user] remove syntax errors

uncloud_pay/management/commands/bootstrap-user.py

@@ -8,7 +8,7 @@ class Command(BaseCommand):
     help = 'Bootstrap user (for testing)'
 
     def add_arguments(self, parser):
-        parser.add_argument('username', type=str)
+        parser.add_argument('--username', type=str, required=True)
 
     def handle(self, *args, **options):
         user = get_user_model().objects.get(username=options['username'])
@@ -35,6 +35,6 @@ class Command(BaseCommand):
 
         # find any order that is associated to this bill
         orders = Order.objects.filter(owner=user)
-        )
+
         print(f"Addr: {addr}")
         print(f"Bill: {bill}")