Make Stream impls part of optional 'stream' cargo feature (#397)

tests/h2-support/Cargo.toml

@@ -5,7 +5,7 @@ authors = ["Carl Lerche <me@carllerche.com>"]
 edition = "2018"
 
 [dependencies]
-h2 = { path = "../..", features = ["unstable"] }
+h2 = { path = "../..", features = ["stream", "unstable"] }
 
 bytes = "0.4.7"
 env_logger = "0.5.9"

tests/h2-tests/tests/server.rs

@@ -239,7 +239,9 @@ async fn abrupt_shutdown() {
         srv.abrupt_shutdown(Reason::INTERNAL_ERROR);
 
         let srv_fut = async move {
-            poll_fn(move |cx| srv.poll_close(cx)).await.expect("server");
+            poll_fn(move |cx| srv.poll_closed(cx))
+                .await
+                .expect("server");
         };
 
         join(req_fut, srv_fut).await;