Replace futures::future::ready with our implementation in examples

Author: kpp

examples/future.rs

@@ -1,12 +1,12 @@
 #![feature(futures_api, async_await, await_macro)]
 
 use futures_async_combinators::future::*;
-use futures::{future, executor};
+use futures::executor;
 
 fn main() {
     executor::block_on(async {
-        let future = future::ready(Ok::<i32, i32>(1));
-        let future = and_then(future, |x| future::ready(Ok::<i32, i32>(x + 3)));
+        let future = ready(Ok::<i32, i32>(1));
+        let future = and_then(future, |x| ready(Ok::<i32, i32>(x + 3)));
         let future = inspect(future, |x| { dbg!(x); });
         assert_eq!(await!(future), Ok(4));
     });