chore: format code and enable rustfmt CI task (#1212)

tokio-timer/src/lib.rs

@@ -32,12 +32,12 @@
 //! [`Timer`]: timer/struct.Timer.html
 
 macro_rules! ready {
-    ($e:expr) => (
+    ($e:expr) => {
         match $e {
             ::std::task::Poll::Ready(v) => v,
             ::std::task::Poll::Pending => return ::std::task::Poll::Pending,
         }
-    )
+    };
 }
 
 pub mod clock;