Added contrib.auth migration for refs #13147.

# -*- coding: utf-8 -*-

from __future__ import unicode_literals

import django.core.validators

from django.db import migrations, models

class Migration(migrations.Migration):

    dependencies = [

        ('auth', '0006_require_contenttypes_0002'),

    ]

    operations = [

        migrations.AlterField(

            model_name='user',

            name='username',

            field=models.CharField(

                error_messages={'unique': 'A user with that username already exists.'},

                help_text='Required. 30 characters or fewer. Letters, digits and @/./+/-/_ only.',

                max_length=30,

                unique=True,

                validators=[

                    django.core.validators.RegexValidator(

                        '^[\\w.@+-]+$', 'Enter a valid username. '

                        'This value may contain only letters, numbers and @/./+/-/_ characters.'

                    ),

                ],

                verbose_name='username',

            ),

        ),

    ]