Revise list of hop-by-hop headers

[l-hedgehog]

The list of hop-by-hop headers in #3621 are taken from rfc2616, and there's Errata 4522 which says

Trailers (with a s) does not seem to a header field, just a keyword for TE.
I think that Trailer (without a s) is expected here.

I think the list here should be updated accordingly.

You might also want to take these discussions 1 2 about the missing of such a list in updated http/1.1 rfc723* into consideration.

How I found this:

I'm using hapijs/h2o2 to proxy request to hapi-auth-hawk protected endpoint, but after upgrading from node 8 to 10, I'm getting an ERR_HTTP_TRAILER_INVALID error, seemingly from the removal of "transfer-encoding" but not "trailer".

[hueniverse]

@mnot Beyond fixing the typo, would you recommend making other changes to the code here:
https://github.com/hapijs/hapi/blob/master/lib/response.js#L15

[mnot]

You appear to be removing headers listed in Connection, so you should be good. There's a discussion at httpwg/http-core#165 that might touch on this in the revised specs.

[lock]

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