fix auto field warning for django 3.2

src/robots/migrations/0002_alter_id_fields.py

@@ -0,0 +1,23 @@
+# Generated by Django 3.2 on 2021-09-23 12:14
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('robots', '0001_initial'),
+    ]
+
+    operations = [
+        migrations.AlterField(
+            model_name='rule',
+            name='id',
+            field=models.BigAutoField(auto_created=True, primary_key=True, serialize=False, verbose_name='ID'),
+        ),
+        migrations.AlterField(
+            model_name='url',
+            name='id',
+            field=models.BigAutoField(auto_created=True, primary_key=True, serialize=False, verbose_name='ID'),
+        ),
+    ]