Fix import of Stdio

Author: NobodyXu

src/lib.rs

@@ -232,7 +232,7 @@ use std::io::{self, Write};
 use std::path::{Component, Path, PathBuf};
 #[cfg(feature = "parallel")]
 use std::process::Child;
-use std::process::Command;
+use std::process::{Command, Stdio};
 use std::sync::{
     atomic::{AtomicU8, Ordering::Relaxed},
     Arc, RwLock,