updated the admin, ordering for mail rules

src/paperless_mail/migrations/0004_mailrule_order.py

@@ -0,0 +1,18 @@
+# Generated by Django 3.1.3 on 2020-11-21 21:51
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('paperless_mail', '0003_auto_20201118_1940'),
+    ]
+
+    operations = [
+        migrations.AddField(
+            model_name='mailrule',
+            name='order',
+            field=models.IntegerField(default=0),
+        ),
+    ]