Update to libp2p 0.9.1 (#2804)

substrate/core/network-libp2p/Cargo.toml

@@ -12,7 +12,7 @@ byteorder = "1.3"
 bytes = "0.4"
 fnv = "1.0"
 futures = "0.1"
-libp2p = { version = "0.9.0", default-features = false, features = ["secp256k1", "libp2p-websocket"] }
+libp2p = { version = "0.9.1", default-features = false, features = ["secp256k1", "libp2p-websocket"] }
 parking_lot = "0.8.0"
 lazy_static = "1.2"
 log = "0.4"

substrate/core/network-libp2p/src/transport.rs

@@ -68,9 +68,7 @@ pub fn build_transport(
 				.map(|(id, muxer)| (id, core::muxing::StreamMuxerBox::new(muxer)))
 		})
 		.with_timeout(Duration::from_secs(20))
-		// TODO: pass the error directly, instead of calling `to_string()`
-		// https://github.com/libp2p/rust-libp2p/issues/1162
-		.map_err(|err| io::Error::new(io::ErrorKind::Other, err.to_string()))
+		.map_err(|err| io::Error::new(io::ErrorKind::Other, err))
 		.boxed();
 
 	(transport, sinks)