chore: bump to newer nightly (#1485)

tokio-executor/src/executor.rs

@@ -49,8 +49,6 @@ use std::pin::Pin;
 /// # Examples
 ///
 /// ```
-/// #![feature(async_await)]
-///
 /// use tokio_executor::Executor;
 ///
 /// # fn docs(my_executor: &mut dyn Executor) {
@@ -79,8 +77,6 @@ pub trait Executor {
     /// # Examples
     ///
     /// ```
-    /// #![feature(async_await)]
-    ///
     /// use tokio_executor::Executor;
     ///
     /// # fn docs(my_executor: &mut dyn Executor) {
@@ -110,8 +106,6 @@ pub trait Executor {
     /// # Examples
     ///
     /// ```
-    /// #![feature(async_await)]
-    ///
     /// use tokio_executor::Executor;
     ///
     /// # fn docs(my_executor: &mut dyn Executor) {

tokio-executor/src/global.rs

@@ -124,8 +124,6 @@ where
 /// # Examples
 ///
 /// ```no_run
-/// #![feature(async_await)]
-///
 /// tokio::spawn(async {
 ///     println!("running on the default executor");
 /// });

tokio-executor/src/threadpool/blocking.rs

@@ -80,8 +80,6 @@ pub struct BlockingError {
 /// that needs to be performed.
 ///
 /// ```rust
-/// #![feature(async_await)]
-///
 /// use tokio_executor::threadpool::{ThreadPool, blocking};
 ///
 /// use futures_util::future::poll_fn;

tokio-executor/src/threadpool/builder.rs

@@ -32,8 +32,6 @@ use std::time::Duration;
 /// # Examples
 ///
 /// ```
-/// #![feature(async_await)]
-///
 /// use tokio_executor::threadpool::Builder;
 ///
 /// use std::time::Duration;

tokio-executor/src/threadpool/sender.rs

@@ -59,8 +59,6 @@ impl Sender {
     /// # Examples
     ///
     /// ```rust
-    /// #![feature(async_await)]
-    ///
     /// use tokio_executor::threadpool::ThreadPool;
     ///
     /// // Create a thread pool with default configuration values

tokio-executor/src/threadpool/thread_pool.rs

@@ -51,8 +51,6 @@ impl ThreadPool {
     /// # Examples
     ///
     /// ```rust
-    /// #![feature(async_await)]
-    ///
     /// use tokio_executor::threadpool::ThreadPool;
     ///
     /// // Create a thread pool with default configuration values

tokio-executor/src/typed.rs

@@ -22,8 +22,6 @@ use crate::SpawnError;
 ///
 /// [`spawn`]: TypedExecutor::spawn
 /// ```
-/// #![feature(async_await)]
-///
 /// use tokio::executor::TypedExecutor;
 /// use tokio::sync::oneshot;
 ///