Prefers macro imports instead of extern crate usages (Rust 2018+)

src/guards.rs

@@ -1,5 +1,3 @@
-extern crate rocket;
-
 use rocket::http::Status;
 use rocket::request::{FromRequest, Outcome, Request};
 use std::net::IpAddr;

src/main.rs

@@ -1,9 +1,7 @@
-#[macro_use]
-extern crate rocket;
-
 use clap::Parser;
 use rocket::http::Status;
 use rocket::serde::{json::Json, Serialize};
+use rocket::{get, launch, routes};
 
 use cruiser::guards::{ClientIP, TrustedProxies};