Fixed a deprecation warning introduced by 96dd48c8.

import re

import importlib

import os

import re

import sys

from django.utils import datetime_safe, importlib

from django.utils.six.moves import input

from django.db.migrations import operations

from django.db.migrations.migration import Migration

from django.db.models.loading import cache

from django.utils import datetime_safe

from django.utils.six.moves import input

class MigrationAutodetector(object):