announcement model.py 里面增加一个新的字段（最后更新时间）

account/migrations/0004_auto_20150806_1251.py

@@ -0,0 +1,23 @@
+# -*- coding: utf-8 -*-
+from __future__ import unicode_literals
+
+from django.db import models, migrations
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('account', '0003_user_email'),
+    ]
+
+    operations = [
+        migrations.RemoveField(
+            model_name='user',
+            name='admin_group',
+        ),
+        migrations.AddField(
+            model_name='user',
+            name='admin_type',
+            field=models.IntegerField(default=0),
+        ),
+    ]