fix examples

Author: yoshuawuyts

examples/chunked.rs

@@ -1,14 +1,15 @@
 use async_std::fs;
 use async_std::io::BufReader;
 use async_std::task;
+use http_types::StatusCode;
 use tide::Response;
 
 fn main() -> Result<(), std::io::Error> {
     task::block_on(async {
         let mut app = tide::new();
         app.at("/").get(|_| async move {
             let file = fs::File::open(file!()).await.unwrap();
-            let res = Response::new(200).body(BufReader::new(file));
+            let res = Response::new(StatusCode::Ok).body(BufReader::new(file));
             res
         });
         app.listen("127.0.0.1:8080").await?;