Fix warnings

src/main.rs

@@ -124,14 +124,14 @@ mod rack {
                 .entries
                 .par_iter()
                 .filter_map(|e| self.check_file(&e.path).ok())
-                .filter(|mat| mat.matches.len() > 0)
+                .filter(|mat| !mat.matches.is_empty())
                 .collect::<Vec<FileMatch>>();
             self.matches.append(&mut results);
 
             Ok(())
         }
 
-        fn should_ignore(&self, gitignore: &Vec<String>, path: &str, entry: &DirEntry) -> bool {
+        fn should_ignore(&self, gitignore: &[String], path: &str, entry: &DirEntry) -> bool {
             if self.config.use_gitignore {
                 let should_ignore = gitignore.iter().find(|&line| path.contains(&line.clone()));