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`.

protocols/ping/src/handler.rs

@@ -282,7 +282,7 @@ mod tests {
     fn tick(h: &mut PingHandler<TcpStream>)
         -> ProtocolsHandlerEvent<protocol::Ping, (), PingResult, PingFailure>
     {
-        futures::executor::block_on(future::poll_fn(|cx| h.poll(cx) ))
+        async_std::task::block_on(future::poll_fn(|cx| h.poll(cx) ))
     }
 
     #[test]