Remove #![feature(async_await)]

darinmorrison · darinmorrison · commit 4afbd6d2bf8a · 2020-01-03T15:29:03.000-07:00
diff --git a/tracing-attributes/test_async_await/tests/async_fn.rs b/tracing-attributes/test_async_await/tests/async_fn.rs
@@ -1,5 +1,3 @@
-#![feature(async_await)]
-
 use test_std_future::{
     PollN,
     block_on_future,
