logout_then_login doesn't take a template name

[gracebrownecodes]

The code at these lines fails https://github.com/bruth/django-registration2/blob/master/registration/auth_urls.py#L8-L10 with "unexpected key" when a project using registration2 tries to get "logout". You can see the offending Django code at https://github.com/bruth/django-registration2/blob/master/registration/auth_urls.py#L8-L10 I think it would be fairly easy to duplicate the logout_then_login (obviously with a template_name option) view within the registration2 code.