update models/new django

Signed-off-by: Nico Schottelius <nico@nico-notebook.schottelius.org>

uncloud_pay/migrations/0004_remove_order_one_time_price.py

@@ -0,0 +1,17 @@
+# Generated by Django 3.1 on 2020-08-08 19:53
+
+from django.db import migrations
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('uncloud_pay', '0003_auto_20200801_2332'),
+    ]
+
+    operations = [
+        migrations.RemoveField(
+            model_name='order',
+            name='one_time_price',
+        ),
+    ]