Remove axum::prelude (#195)

examples/sse.rs

@@ -6,9 +6,9 @@
 
 use axum::{
     extract::TypedHeader,
-    prelude::*,
+    handler::get,
     response::sse::{sse, Event, Sse},
-    routing::nest,
+    routing::{nest, RoutingDsl},
 };
 use futures::stream::{self, Stream};
 use http::StatusCode;