stream: add `next` and `map` utility fn (#1962)

Introduces `StreamExt` trait. This trait will be used to add utility functions
to make working with streams easier. This patch includes two functions:

* `next`: a future returning the item in the stream.
* `map`: transform each item in the stream.

1 files changed, 2 insertions, 1 deletions

diff --git a/examples/tinyhttp.rs b/examples/tinyhttp.rs
index 5ddf0d48..9ac2806e 100644
--- a/examples/tinyhttp.rs
+++ b/examples/tinyhttp.rs
@@ -14,13 +14,14 @@
 #![warn(rust_2018_idioms)]
 
 use bytes::BytesMut;
-use futures::{SinkExt, StreamExt};
+use futures::SinkExt;
 use http::{header::HeaderValue, Request, Response, StatusCode};
 #[macro_use]
 extern crate serde_derive;
 use serde_json;
 use std::{env, error::Error, fmt, io};
 use tokio::net::{TcpListener, TcpStream};
+use tokio::stream::StreamExt;
 use tokio_util::codec::{Decoder, Encoder, Framed};
 
 #[tokio::main]