fix: adjust path type in print_diff function for consistency (#8)

Author: orangekame3

src/main.rs

@@ -1,6 +1,6 @@
 use std::fs;
 use std::io::{self, Read};
-use std::path::PathBuf;
+use std::path::{Path, PathBuf};
 
 use anyhow::{Context, Result};
 use clap::Parser;
@@ -96,7 +96,7 @@ fn format_file(
     Ok(())
 }
 
-fn print_diff(original: &str, formatted: &str, path: &PathBuf) {
+fn print_diff(original: &str, formatted: &str, path: &Path) {
     if original == formatted {
         return;
     }