fix export FutureExt

Author: k-nasa

src/future/future.rs

@@ -120,9 +120,9 @@ extension_trait! {
         ///
         /// ```
         /// # async_std::task::block_on(async {
+        /// use async_std::prelude::*;
         /// use async_std::future;
         /// use std::time::Duration;
-        /// use async_std::future::FutureExt;
         ///
         /// let a = future::ready(1).delay(Duration::from_millis(2000));
         /// dbg!(a.await);

src/future/mod.rs

@@ -51,7 +51,6 @@ pub use async_macros::{select, try_select};
 use cfg_if::cfg_if;
 
 pub use future::Future;
-pub use future::FutureExt;
 pub use pending::pending;
 pub use poll_fn::poll_fn;
 pub use ready::ready;