Option --hack-translations not work

[Apkawa]

I got exception

Traceback (most recent call last):
  File "manage.py", line 22, in <module>
    execute_from_command_line(sys.argv)
  File "/usr/local/lib/python3.6/dist-packages/django/core/management/__init__.py", line 364, in execute_from_command_line
    utility.execute()
  File "/usr/local/lib/python3.6/dist-packages/django/core/management/__init__.py", line 356, in execute
    self.fetch_command(subcommand).run_from_argv(self.argv)
  File "/usr/local/lib/python3.6/dist-packages/django/core/management/base.py", line 283, in run_from_argv
    self.execute(*args, **cmd_options)
  File "/usr/local/lib/python3.6/dist-packages/django/core/management/base.py", line 330, in execute
    output = self.handle(*args, **options)
  File "/usr/local/lib/python3.6/dist-packages/cities_light/management/commands/cities_light.py", line 226, in handle
    pickle.dump(self.translation_data, f)
TypeError: write() argument must be str, not bytes

django-cities-light==3.5.0
python-3.6

django-cities-light/cities_light/management/commands/cities_light.py

Line 225 in 88b8970

with open(translation_hack_path, 'w+') as f:

'w+' -> 'wb+'

django-cities-light/cities_light/management/commands/cities_light.py

Line 229 in 88b8970

with open(translation_hack_path, 'r') as f:

'r' -> 'rb'