Reduce futures crate dependency (#156)

Author: tottoto

Cargo.toml

@@ -35,8 +35,7 @@ webpki-roots = {version = "0.26.0", optional = true}
 [dev-dependencies]
 anyhow = "1.0.61"
 env_logger = "0.10.0"
-futures = "0.3.23"
-futures-util = "0.3.23"
+futures-util = {version = "0.3.23", default-features = false}
 http02 = {package = "http", version = "0.2"}
 hyper = "0.14.20"
 lazy_static = "1.4.0"

tests/tools/tls.rs

@@ -7,9 +7,8 @@ use std::io::{self, BufReader, Cursor, Read};
 use std::path::PathBuf;
 use std::pin::Pin;
 use std::sync::Arc;
-use std::task::{Context, Poll};
+use std::task::{Context, Poll, ready};
 
-use futures::ready;
 use hyper::server::accept::Accept;
 use hyper::server::conn::{AddrIncoming, AddrStream};
 use tokio::io::{AsyncRead, AsyncWrite, ReadBuf};