Added contrib.auth migration for refs #13147.

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

from __future__ import unicode_literals

from django.db import models, migrations

import django.core.validators

class Migration(migrations.Migration):

    dependencies = [

        ('auth', '0003_alter_user_email_max_length'),

    ]

    # No database changes; modifies validators and error_messages (#13147).

    operations = [

        migrations.AlterField(

            model_name='user',

            name='username',

            field=models.CharField(error_messages={'unique': 'A user with that username already exists.'}, max_length=30, validators=[django.core.validators.RegexValidator('^[\\w.@+-]+$', 'Enter a valid username. This value may contain only letters, numbers and @/./+/-/_ characters.', 'invalid')], help_text='Required. 30 characters or fewer. Letters, digits and @/./+/-/_ only.', unique=True, verbose_name='username'),

        ),

    ]