Several changes.

- Pin `futures_codec` to version 0.3.3 as later versions require
at least bytes-0.5 which he have not upgraded to yet.
- Replace `futures::executor::block_on` with `async_std::task::block_on`
where `async-std` is already a dependency to work around an issue with
`park`/`unpark` behaviour.
- Use the published version of `quicksink`.

transports/tcp/src/lib.rs

@@ -486,7 +486,7 @@ mod tests {
             .for_each(|_| futures::future::ready(()));
 
         let client = TcpConfig::new().dial(addr).expect("dialer");
-        futures::executor::block_on(futures::future::join(server, client)).1.unwrap();
+        async_std::task::block_on(futures::future::join(server, client)).1.unwrap();
     }
 
     #[test]