fix: test

Author: NewbMiao

.github/workflows/check_guides.sh

@@ -23,6 +23,7 @@ EOF
     tokio = { version = "1", features = ["full"] }
     http-body-util = "0.1"
     hyper-util = { version = "0.1", features = ["full"] }
+    tower = { version = "0.4" }
 EOF
             cargo build --manifest-path "$value/Cargo.toml"
         fi

_stable/server/middleware.md

@@ -9,13 +9,13 @@ Let's create a Logger middleware in [hello-world server](https://hyper.rs/guides
 
 Add tower dependency first
 
-```rust
+```toml
 [dependencies]
 hyper = { version = "1", features = ["full"] }
 tokio = { version = "1", features = ["full"] }
 http-body-util = "0.1"
 hyper-util = { version = "0.1", features = ["full"] }
-tower = { version = "0.4.13" } // here
+tower = { version = "0.4" } // here
 ```
 
 ## Option 1: Use hyper Service trait
@@ -143,7 +143,6 @@ use http_body_util::Full;
 use hyper_util::{rt::TokioIo, service::TowerToHyperService};
 use tokio::net::TcpListener;
 use tower::ServiceBuilder;
-use crate::logger::Logger as Logger;
 async fn hello(_: Request<Incoming>) -> Result<Response<Full<Bytes>>, Infallible> {
     Ok(Response::new(Full::new(Bytes::from("Hello, World!"))))
 }