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The Request is a WritableStreamInterface and now obeys its method and event semantics.
The Response is a ReadableStreamInterface and now obeys its method and event semantics.

Resolves / closes #70
Supersedes / closes #83
Builds on top of / closes #87 (thanks @maciejmrozinski!)

Accordingly, the `drain` event now behaves consistently and we no longer
need the custom `headers-written` event.

I'm a bit late but you forget to update README.

$response->on('data', function ($data, $response) {

should be

$response->on('data', function ($data) {

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Feel free to open a PR fixing this 👍