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

tokio-timer/src/timer/entry.rs

@@ -290,7 +290,6 @@ impl Entry {
     }
 
     pub fn poll_elapsed(&self, cx: &mut task::Context<'_>) -> Poll<Result<(), Error>> {
-
         let mut curr = self.state.load(SeqCst);
 
         if is_elapsed(curr) {

tokio-timer/src/timer/handle.rs

@@ -3,7 +3,7 @@ use crate::{Delay, Error, /*Interval,*/ Timeout};
 use std::cell::RefCell;
 use std::fmt;
 use std::sync::{Arc, Weak};
-use std::time::{/*Duration,*/ Instant};
+use std::time::Instant;
 use tokio_executor::Enter;
 
 /// Handle to timer instance.