main.rs: Add comment about better error handling

src/main.rs

@@ -60,6 +60,10 @@ async fn main() -> std::io::Result<()> {
     HttpServer::new(move || {
         App::new()
             .wrap(middleware::NormalizePath::trim())
+            // TODO(tlater): When actix-web 4.3 releases, this can be improved a
+            // lot because of this PR:
+            //
+            // https://github.com/actix/actix-web/pull/2784
             .wrap(
                 ErrorHandlers::new()
                     .handler(StatusCode::NOT_FOUND, generic_error)