Remove serde_derive https://github.com/serde-rs/serde/issues/1441#issuecomment-445481084

web-cors/backend/src/main.rs

@@ -1,6 +1,3 @@
-#[macro_use]
-extern crate serde_derive;
-
 use actix_cors::Cors;
 use actix_web::{http::header, middleware::Logger, web, App, HttpServer};
 

web-cors/backend/src/user.rs

@@ -1,4 +1,5 @@
 use actix_web::web;
+use serde::{Deserialize, Serialize};
 
 #[derive(Deserialize, Serialize, Debug)]
 pub struct Info {