Call link rich menu to user API.

        https://developers.line.me/en/docs/messaging-api/reference/#link-rich-menu-to-user

        :param str user_id: ID of an uploaded rich menu
        :param str rich_menu_id: ID of the user
        :type timeout: float | tuple(float, float)

def link_rich_menu_to_user(self, user_id, rich_menu_id, timeout=None):
        """Call link rich menu to user API.

        https://developers.line.me/en/docs/messaging-api/reference/#link-rich-menu-to-user

        :param str user_id: ID of an uploaded rich menu
        :param str rich_menu_id: ID of the user
        :type timeout: float | tuple(float, float)
        """
        self._post(
            '/v2/bot/user/{user_id}/richmenu/{rich_menu_id}'.format(
                user_id=user_id,
                rich_menu_id=rich_menu_id
            ),
            timeout=timeout
        )