client: sleep 1s between connection attemps

src/client.rs

@@ -1,6 +1,7 @@
 use std::sync::Arc;
 use futures::stream::TryStreamExt;
 use mpart_async::server::MultipartParser;
+use tokio::time::{Duration, sleep};
 use reqwest::StatusCode;
 use crate::app::App;
 
@@ -57,6 +58,6 @@ pub async fn run(app: App) {
         run_once(&app).await
             .unwrap_or_else(|e| println!("Client: {:?}", e));
 
-        // TODO: delay with backoff
+        sleep(Duration::from_secs(1)).await;
     }
 }