Reorganize method routers for handlers and services (#405)

* Re-organize method routing for handlers

* Re-organize method routing for services

* changelog

examples/unix-domain-socket/src/main.rs

@@ -7,8 +7,8 @@
 use axum::{
     body::Body,
     extract::connect_info::{self, ConnectInfo},
-    handler::get,
     http::{Method, Request, StatusCode, Uri},
+    routing::get,
     Router,
 };
 use futures::ready;