Method notification

plugins/src/lib.rs:158–161

(mut self, notif: messages::NotificationTopic)

    }

    pub fn notification(mut self, notif: messages::NotificationTopic) -> Builder<S, I, O> {
        self.notifications.push(notif);
        self
    }

    /// Subscribe to notifications for the given `topic`. The handler
    /// is an async function that takes a `Plugin<S>` and the