chore: change default lint level to warning and deny warnings in CI (#1416)

tokio-timer/tests/clock.rs

@@ -1,4 +1,4 @@
-#![deny(warnings, rust_2018_idioms)]
+#![warn(rust_2018_idioms)]
 
 use std::time::Instant;
 use tokio_timer::clock;

tokio-timer/tests/delay.rs

@@ -1,4 +1,4 @@
-#![deny(warnings, rust_2018_idioms)]
+#![warn(rust_2018_idioms)]
 #![feature(async_await)]
 
 use tokio_test::task::MockTask;

tokio-timer/tests/hammer.rs

@@ -1,4 +1,4 @@
-#![deny(warnings, rust_2018_idioms)]
+#![warn(rust_2018_idioms)]
 #![feature(async_await)]
 
 use tokio_current_thread::CurrentThread;

tokio-timer/tests/interval.rs

@@ -1,4 +1,4 @@
-#![deny(warnings, rust_2018_idioms)]
+#![warn(rust_2018_idioms)]
 #![feature(async_await)]
 
 use tokio_test::task::MockTask;

tokio-timer/tests/queue.rs

@@ -1,4 +1,4 @@
-#![deny(warnings, rust_2018_idioms)]
+#![warn(rust_2018_idioms)]
 
 use tokio_test::task::MockTask;
 use tokio_test::{assert_ok, assert_pending, assert_ready, clock};

tokio-timer/tests/throttle.rs

@@ -1,4 +1,4 @@
-#![deny(warnings, rust_2018_idioms)]
+#![warn(rust_2018_idioms)]
 #![cfg(feature = "async-traits")]
 
 use tokio_sync::mpsc;

tokio-timer/tests/timeout.rs

@@ -1,4 +1,4 @@
-#![deny(warnings, rust_2018_idioms)]
+#![warn(rust_2018_idioms)]
 #![feature(async_await)]
 
 use tokio_sync::oneshot;