Fix lints (#186)

Author: mmastrac

examples/async_helpers/mod.rs

@@ -2,11 +2,13 @@
 
 #[cfg(feature = "tokio-runtime")]
 extern crate tokio;
+#[allow(unused_imports)]
 #[cfg(feature = "tokio-runtime")]
 pub use tokio::{main, test};
 
 #[cfg(feature = "async-std-runtime")]
 extern crate async_std;
+#[allow(unused_imports)]
 #[cfg(feature = "async-std-runtime")]
 pub use async_std::{main, test};
 

src/codec/mod.rs

@@ -23,6 +23,7 @@ use futures_util::Sink;
 use std::pin::Pin;
 use std::task::{Context, Poll};
 
+#[allow(clippy::enum_variant_names)]
 #[derive(Debug, Clone)]
 pub enum Message {
     Greeting(ZmqGreeting),