Add a new Webhook and return a :class:`Webhook` object.

        :param name: name of the :class:`Webhook`
        :param url: payload url of the :class:`Webhook`
        :param key: secret key of the :class:`Webhook`
        :param attrs: optional attributes for :class:`Webhook`

def add_webhook(self, name, url, key, **attrs):
        """
        Add a new Webhook and return a :class:`Webhook` object.

        :param name: name of the :class:`Webhook`
        :param url: payload url of the :class:`Webhook`
        :param key: secret key of the :class:`Webhook`
        :param attrs: optional attributes for :class:`Webhook`
        """
        return Webhooks(self.requester).create(
            self.id, name, url, key, **attrs
        )