Add a certificate revocation list to this store.

        The certificate revocation lists added to a store will only be used if
        the associated flags are configured to check certificate revocation
        lists.

        .. versionadded:: 16.1.0

        :param CRL crl: The certificate revocation list to add to this store.
        :return: ``None`` if the certificate revocation list was added
            successfully.
        r