Store ID of profile locally.

        .. versionadded:: 4.0.6

def save_profile_id(self, profile: Profile):
        """
        Store ID of profile locally.

        .. versionadded:: 4.0.6
        """
        os.makedirs(self.dirname_pattern.format(profile=profile.username,
                                                target=profile.username), exist_ok=True)
        with open(self._get_id_filename(profile.username), 'w') as text_file:
            text_file.write(str(profile.userid) + "\n")
            self.context.log("Stored ID {0} for profile {1}.".format(profile.userid, profile.username))