doc(tokio): Set keep_alive to false on hyper clients.

This prevents hanging event loops.

examples/test-installed/src/main.rs

@@ -9,7 +9,9 @@ use std::path::Path;
 
 fn main() {
     let https = HttpsConnector::new(1).expect("tls");
-    let client = Client::builder().build::<_, hyper::Body>(https);
+    let client = Client::builder()
+        .keep_alive(false)
+        .build::<_, hyper::Body>(https);
     let ad = yup_oauth2::DefaultFlowDelegate;
     let secret = yup_oauth2::read_application_secret(Path::new("clientsecret.json"))
         .expect("clientsecret.json");
@@ -35,6 +37,5 @@ fn main() {
         Ok(())
     });
 
-    let mut rt = tokio::runtime::Runtime::new().unwrap();
-    rt.block_on(fut).unwrap();
+    tokio::run(fut)
 }