How to send status code along with trailers in a Body::channel?

Hello, first of all, thanks for this great project!

I'm using hyper to create an Icecast compatible streaming server and I didn't find a way to send a status code along with trailers in a body constructed from `Body::channel`.

Is this possible? I only see that `send_trailers` accepts a `HeaderMap` but no `StatusCode`.

I'm sure I'm missing something.

Thank you!