removed unneeded use statement.

src/install.rs

@@ -1,7 +1,7 @@
 use fs_extra::dir::{CopyOptions, copy};
 use std::env;
 use std::error::Error;
-use std::fs::{File, create_dir_all, read_dir, remove_dir_all};
+use std::fs::{File, create_dir_all, remove_dir_all};
 use std::io::Write;
 use std::path::PathBuf;
 use std::process::Command;