[✨] ServerRequestEvent needs httpVersion entry to solve HTTP/2 specific problems.

[genki]

Is your feature request related to a problem?

When using dev-server as https, currently it warns like this:

(node:79236) UnsupportedWarning: Status message is not supported by HTTP/2 (RFC7540 8.1.2.4)
(Use `node --trace-warnings ...` to show where the warning was created)

This is happening because the server response body contains status message that is not allowed for HTTP/2 protocol.
So then it is necessary to provide the body conditional to the protocol version, but there is no informations about it in the ServerRequestEvent.

Describe the solution you'd like

My suggestion is add httpVersion: {major:number, minor:number} to the ServerRequestEvent interface.
That can be acquired from IncomingMessage.

Describe alternatives you've considered

Sorry, I couldn't come up with other solution.

Additional context

No response

[genki]

I have found this issue is still happening.
So I traced warning, the reason of the problem is found in the finalhandler.
I have sent a PR to fix it.
pillarjs/finalhandler#45