Async `Paginator<T>` does not seem to be `Send`

[powpingdone]

Describe the bug Functions that return Paginator<T> do not implement Send, preventing it from being used in stuff like tokio::spawn()

Sample code

    'big: while let Some(plist) = rx.recv().await {

        // gather tracks
        wait!(w);
        let mut plist_items = ~139
            client.playlist_items(&plist, Some("items.track.(id,preview_url)"), None); // creates a stream
        // other things...
        wait!(w);
        while let Some(Ok(track)) = plist_items.next().await {
            // doing stuff with `track`
            wait!(w);
        }

        // send tracks
        tx_track.send((plist.clone(), tracks_url)).await.unwrap();
        tx_meta.send((plist.clone(), tracks)).await.unwrap(); ~160
    } ~163

Attached Compiler Error

error: future cannot be sent between threads safely
   --> src/main.rs:286:22
    |
286 |         tokio::spawn(playlist_track_scrape(gov.clone(), pb1, rx_ps, tx_track, tx_meta)),
    |                      ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ future returned by `playlist_track_scrape` is not `Send`
    |
    = help: the trait `std::marker::Send` is not implemented for `dyn futures::Stream<Item = Result<PlaylistItem, ClientError>>`
note: future is not `Send` as this value is used across an await
   --> src/main.rs:160:46
    |
139 |         let mut plist_items =
    |             --------------- has type `Pin<Box<dyn futures::Stream<Item = Result<PlaylistItem, ClientError>>>>` which is not `Send`
...
160 |         tx_meta.send((plist.clone(), tracks)).await.unwrap();
    |                                              ^^^^^^ await occurs here, with `mut plist_items` maybe used later
163 |     }
    |     - `mut plist_items` is later dropped here

[powpingdone]

Lack of knowledge on my part caused this. Sorry.