Made BaseCommand.get_version() docstring consistent with docs.

    def get_version(self):

        """

        Return the Django version, which should be correct for all

        built-in Django commands. User-supplied commands should

        override this method.

        Return the Django version, which should be correct for all built-in

        Django commands. User-supplied commands can override this method to

        return their own version.

        """

        return django.get_version()