Readme code error

[yingshaoxo]

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I got some errors here, it shouldn't be.

Did I miss any dependencies?

use futures::stream::StreamExt;
use std::pin::Pin;
use tokio::sync::broadcast;
use tokio_stream::wrappers::BroadcastStream;
use tokio_stream::Stream;

use dasp::signal;
use rawsample::{SampleFormat, SampleReader, SampleWriter};