remove unwraps in multipart examples

inspired by #406

json/jsonrpc/Cargo.toml

@@ -6,9 +6,10 @@ edition = "2018"
 
 [dependencies]
 actix-web = "3"
+
 bytes = "0.5"
 env_logger = "0.8"
-futures = "0.3.1"
+futures-util = "0.3"
 log = "0.4"
 serde = { version = "1.0", features = ["derive"] }
 serde_json = "1.0"

json/jsonrpc/src/main.rs

@@ -1,14 +1,17 @@
 // Allow this lint since it's fine to use type directly in the short example.
 #![allow(clippy::type_complexity)]
 
-use std::error;
-use std::pin::Pin;
-use std::sync::{Arc, RwLock};
-use std::time::Duration;
+use std::{
+    error,
+    future::Future,
+    pin::Pin,
+    sync::{Arc, RwLock},
+    time::Duration,
+};
 
 use actix_web::{middleware, web, App, Error, HttpResponse, HttpServer};
 use bytes::Bytes;
-use futures::{Future, FutureExt};
+use futures_util::FutureExt as _;
 use serde_json::Value;
 
 #[allow(dead_code)]