[pre-commit.ci] auto fixes from pre-commit.com hooks

for more information, see https://pre-commit.ci

Author: pre-commit-ci[bot]

migrations/0002_alter_testmodel_active.py

@@ -1,5 +1,5 @@
 # Generated by Django 3.2.4 on 2021-07-03 05:41
-
+import django
 from django.db import migrations, models
 
 
@@ -10,9 +10,21 @@ class Migration(migrations.Migration):
     ]
 
     operations = [
-        migrations.AlterField(
-            model_name="testmodel",
-            name="active",
-            field=models.BooleanField(default=True),
+        (
+            (
+                migrations.AlterField(
+                    model_name="testmodel",
+                    name="active",
+                    field=models.NullBooleanField(default=True),
+                )
+            )
+            if django.VERSION < (2, 1)
+            else (
+                migrations.AlterField(
+                    model_name="testmodel",
+                    name="active",
+                    field=models.BooleanField(default=True),
+                )
+            )
         ),
     ]