remove unused imports under the tokio feature

Author: sbstp

src/gz/bufread.rs

@@ -3,11 +3,6 @@ use std::io::prelude::*;
 use std::io;
 use std::mem;
 
-#[cfg(feature = "tokio")]
-use futures::Poll;
-#[cfg(feature = "tokio")]
-use tokio_io::{AsyncRead, AsyncWrite};
-
 use super::{Builder, Header};
 use super::{FCOMMENT, FEXTRA, FHCRC, FNAME};
 use Compression;

src/gz/mod.rs

@@ -3,11 +3,6 @@ use std::ffi::CString;
 use std::io::prelude::*;
 use std::time;
 
-#[cfg(feature = "tokio")]
-use futures::Poll;
-#[cfg(feature = "tokio")]
-use tokio_io::{AsyncRead, AsyncWrite};
-
 use {Compress, Compression};
 use bufreader::BufReader;
 use crc::{Crc, CrcReader};

src/gz/read.rs

@@ -1,11 +1,6 @@
 use std::io::prelude::*;
 use std::io;
 
-#[cfg(feature = "tokio")]
-use futures::Poll;
-#[cfg(feature = "tokio")]
-use tokio_io::{AsyncRead, AsyncWrite};
-
 use super::{Builder, Header};
 use Compression;
 use bufreader::BufReader;