How to use the doc8.checks.CheckMaxLineLength function in doc8

def fetch_checks(cfg):
    base = [
        checks.CheckValidity(cfg),
        checks.CheckTrailingWhitespace(cfg),
        checks.CheckIndentationNoTab(cfg),
        checks.CheckCarriageReturn(cfg),
        checks.CheckMaxLineLength(cfg),
        checks.CheckNewlineEndOfFile(cfg),
    ]
    mgr = extension.ExtensionManager(
        namespace="doc8.extension.check", invoke_on_load=True, invoke_args=(cfg.copy(),)
    )
    addons = []
    for e in mgr:
        addons.append(e.obj)
    return base + addons

def __init__(self, cfg):
        super(CheckMaxLineLength, self).__init__(cfg)
        self._max_line_length = self._cfg["max_line_length"]
        self._allow_long_titles = self._cfg["allow_long_titles"]