Import Arc into update_listeners.rs
@@ -112,7 +112,7 @@ use crate::{
RequestError,
};
-use std::{convert::TryInto, time::Duration};
+use std::{convert::TryInto, sync::Arc, time::Duration};
/// A generic update listener.
pub trait UpdateListener<E>: Stream<Item = Result<Update, E>> {
