added the bigger username migration and change

cas_server/migrations/0013_auto_20170329_1748.py

+# -*- coding: utf-8 -*-
+# Generated by Django 1.10.5 on 2017-03-29 15:48
+from __future__ import unicode_literals
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('cas_server', '0012_auto_20170328_1610'),
+    ]
+
+    operations = [
+        migrations.AlterField(
+            model_name='user',
+            name='username',
+            field=models.CharField(max_length=250),
+        ),
+    ]

cas_server/models.py

@@ -273,7 +273,7 @@ class User(models.Model):
     #: The session key of the current authenticated user
     session_key = models.CharField(max_length=40, blank=True, null=True)
     #: The username of the current authenticated user
-    username = models.CharField(max_length=30)
+    username = models.CharField(max_length=250)
     #: Last time the authenticated user has do something (auth, fetch ticket, etc…)
     date = models.DateTimeField(auto_now=True)
     #: last time the user logged