remove TODO

src/main.rs

@@ -105,7 +105,7 @@ async fn normal(cfg: config::Config) -> eyre::Result<()>
 	// `.2` indicates if we should compress while in normal write mode.
 	Some((stream_fut, None, compress)) => {
 	    let stream = stream_fut.await?; 
-	    serial::write_async(stream, &graph, compress).await // TODO: raw version, how to implement?
+	    serial::write_async(stream, &graph, compress).await
 		.wrap_err(eyre!("Failed to serialise graph to stream"))?;
 	},
 	#[cfg(feature="prealloc")] Some((_task_fut, Some(output_file), _)) => {