run cargo fix --edition-idioms

examples/fetch/src/lib.rs

@@ -1,8 +1,8 @@
-extern crate futures;
-extern crate js_sys;
-extern crate wasm_bindgen;
-extern crate wasm_bindgen_futures;
-extern crate web_sys;
+
+
+
+
+use web_sys;
 #[macro_use]
 extern crate serde_derive;