fix force output stdout and stderr.

src/unar.rs

@@ -1,6 +1,6 @@
 use std::io;
 use std::path::Path;
-use std::process::Command;
+use std::process::{Command, Stdio};
 
 pub fn unar_file(path: &Path) -> io::Result<()> {
     println!("UNAR: {}", path.display());
@@ -16,6 +16,8 @@ pub fn unar_file(path: &Path) -> io::Result<()> {
         .current_dir(parent_dir)
         .arg("-s") // -force-skip: skip if exists
         .arg(filename)
+        .stdout(Stdio::inherit())
+        .stderr(Stdio::inherit())
         .spawn()?.wait_with_output();
 
     match output {