Correct readme

Author: skade

README.md

@@ -13,7 +13,7 @@ use async_std::net::TcpStream;
 
 // ...
 
-let tcp_stream = TcpStream::connect("rust-lang.org:443");
+let tcp_stream = TcpStream::connect("rust-lang.org:443").await?;
 let connector = TlsConnector::default();
 let handshake = connector::connect("www.rust-lang.org")?;
 let mut tls_stream = handshake.await?;