chore: remove tokio-futures facade crate (#1327)

This switches from using the tokio-futures facade to referencing
futures-* crates directly.

tokio-codec/src/framed_read.rs

@@ -1,14 +1,15 @@
-use std::fmt;
-use std::pin::Pin;
-use std::task::{Context, Poll};
-
 use super::framed::Fuse;
 use super::Decoder;
-use tokio_futures::{Sink, Stream};
+
 use tokio_io::AsyncRead;
 
 use bytes::BytesMut;
+use futures_core::Stream;
+use futures_sink::Sink;
 use log::trace;
+use std::fmt;
+use std::pin::Pin;
+use std::task::{Context, Poll};
 
 /// A `Stream` of messages decoded from an `AsyncRead`.
 pub struct FramedRead<T, D> {