Use models.JSONField() from Django 3.1

instead of the specialized postgres type available earlier

tcms_github_marketplace/migrations/0004_models_jsonfield.py

@@ -0,0 +1,18 @@
+# Generated by Django 3.1.1 on 2020-09-13 12:48
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('tcms_github_marketplace', '0003_sender_email_field'),
+    ]
+
+    operations = [
+        migrations.AlterField(
+            model_name='purchase',
+            name='payload',
+            field=models.JSONField(),
+        ),
+    ]

tcms_github_marketplace/models.py

@@ -1,9 +1,8 @@
-# Copyright (c) 2019 Alexander Todorov <atodorov@MrSenko.com>
+# Copyright (c) 2019-2020 Alexander Todorov <atodorov@MrSenko.com>
 
 # Licensed under the GPL 3.0: https://www.gnu.org/licenses/gpl-3.0.txt
 
 from django.db import models
-from django.contrib.postgres.fields import JSONField
 from django.contrib.postgres.indexes import GinIndex
 
 
@@ -20,7 +19,7 @@ class Purchase(models.Model):
     # this is for internal purposes
     received_on = models.DateTimeField(db_index=True, auto_now_add=True)
 
-    payload = JSONField()
+    payload = models.JSONField()
 
     class Meta:
         indexes = [