Wire up Trailers frame

src/lib.rs

@@ -41,6 +41,8 @@ pub use proto::Connection;
 use bytes::Bytes;
 
 pub type FrameSize = u32;
+// TODO: remove if carllerche/http#90 lands
+pub type HeaderMap = http::HeaderMap<http::header::HeaderValue>;
 
 /// An H2 connection frame
 #[derive(Debug)]
@@ -57,7 +59,7 @@ pub enum Frame<T, B = Bytes> {
     },
     Trailers {
         id: StreamId,
-        headers: (),
+        headers: HeaderMap,
     },
     PushPromise {
         id: StreamId,