cargo fmt (#604)

Run rustfmt and setup CI to check for it.

examples/async_multiple_requests.rs

@@ -1,11 +1,5 @@
 #![deny(warnings)]
 
-extern crate futures;
-extern crate reqwest;
-extern crate tokio;
-extern crate serde;
-extern crate serde_json;
-
 use futures::Future;
 use reqwest::r#async::{Client, Response};
 use serde::Deserialize;
@@ -21,27 +15,18 @@ struct SlideshowContainer {
     slideshow: Slideshow,
 }
 
-fn fetch() -> impl Future<Item=(), Error=()> {
+fn fetch() -> impl Future<Item = (), Error = ()> {
     let client = Client::new();
 
-    let json = |mut res : Response | {
-        res.json::<SlideshowContainer>()
-    };
+    let json = |mut res: Response| res.json::<SlideshowContainer>();
 
-    let request1 =
-        client
-            .get("https://httpbin.org/json")
-            .send()
-            .and_then(json);
+    let request1 = client.get("https://httpbin.org/json").send().and_then(json);
 
-    let request2 =
-        client
-            .get("https://httpbin.org/json")
-            .send()
-            .and_then(json);
+    let request2 = client.get("https://httpbin.org/json").send().and_then(json);
 
-    request1.join(request2)
-        .map(|(res1, res2)|{
+    request1
+        .join(request2)
+        .map(|(res1, res2)| {
             println!("{:?}", res1);
             println!("{:?}", res2);
         })