Update to Tokio 0.3.0-alpha.3

example-service/src/client.rs

@@ -4,8 +4,6 @@
 // license that can be found in the LICENSE file or at
 // https://opensource.org/licenses/MIT.
 
-#![feature(async_await)]
-
 use clap::{App, Arg};
 use std::io;
 use tarpc::{client, context};

example-service/src/lib.rs

@@ -4,8 +4,6 @@
 // license that can be found in the LICENSE file or at
 // https://opensource.org/licenses/MIT.
 
-#![feature(async_await)]
-
 /// This is the service definition. It looks a lot like a trait definition.
 /// It defines one RPC, hello, which takes one arg, name, and returns a String.
 #[tarpc::service]

example-service/src/server.rs

@@ -4,8 +4,6 @@
 // license that can be found in the LICENSE file or at
 // https://opensource.org/licenses/MIT.
 
-#![feature(async_await)]
-
 use clap::{App, Arg};
 use futures::{
     future::{self, Ready},