style: remove unused std::io imports

src/compression/lz4.rs

@@ -1,8 +1,6 @@
 use anyhow::Result;
 use std::fs::File;
-use std::io::{Read,Write};
 use std::path::PathBuf;
-use std::io;
 use log::*;
 
 use lz4_flex::frame::{FrameDecoder, FrameEncoder};

src/compression/none.rs

@@ -1,8 +1,6 @@
 use anyhow::Result;
 use std::fs::File;
-use std::io::{Read,Write};
 use std::path::PathBuf;
-use std::io;
 use log::*;
 
 use crate::compression::CompressionEngine;

src/compression/program.rs

@@ -1,12 +1,10 @@
 use anyhow::{Context, Result, anyhow};
 use std::fs::File;
-use std::io::{Read,Write};
 use std::process::{Command,Stdio};
 use std::path::PathBuf;
 use std::env;
 use std::fs;
 use std::os::unix::fs::PermissionsExt;
-use std::io;
 use log::*;
 
 use crate::compression::CompressionEngine;