chore: use ready macro from futures-core (#1300)

tokio-reactor/src/lib.rs

@@ -32,15 +32,6 @@
 //! [`PollEvented`]: struct.PollEvented.html
 //! [reactor module]: https://docs.rs/tokio/0.1/tokio/reactor/index.html
 
-macro_rules! ready {
-    ($e:expr) => {
-        match $e {
-            ::std::task::Poll::Ready(v) => v,
-            ::std::task::Poll::Pending => return ::std::task::Poll::Pending,
-        }
-    };
-}
-
 mod poll_evented;
 mod registration;
 mod sharded_rwlock;

tokio-reactor/src/poll_evented.rs

@@ -1,4 +1,5 @@
 use crate::{Handle, Registration};
+use futures_core::ready;
 use mio;
 use mio::event::Evented;
 use std::fmt;