style(lib): run rustfmt and enforce in CI

examples/tower_client.rs

@@ -1,8 +1,8 @@
 #![deny(warnings)]
 
-use hyper::client::service::Connect;
 use hyper::client::conn::Builder;
 use hyper::client::connect::HttpConnector;
+use hyper::client::service::Connect;
 use hyper::service::Service;
 use hyper::{Body, Request};
 
@@ -14,7 +14,6 @@ async fn main() -> Result<(), Box<dyn std::error::Error>> {
 
     let uri = "http://127.0.0.1:8080".parse::<http::Uri>()?;
 
-
     let mut svc = mk_svc.call(uri.clone()).await?;
 
     let body = Body::empty();