Use HashMap::default instead of HashMap::new when possible

Author: taiki-e

src/main.rs

@@ -1280,7 +1280,7 @@ fn resolve_excluded_paths(cx: &Context) -> Vec<Utf8PathBuf> {
         .iter()
         .map(|id| cx.ws.metadata.packages[id].manifest_path.parent().unwrap());
     let mut excluded_path = vec![];
-    let mut contains: HashMap<&Utf8Path, Vec<_>> = HashMap::new();
+    let mut contains: HashMap<&Utf8Path, Vec<_>> = HashMap::default();
     for included in included {
         for &excluded in excluded.iter().filter(|e| included.starts_with(e)) {
             if let Some(v) = contains.get_mut(&excluded) {