Update docs to show that req is passed to host resolver function. [ was: Request obj in host param ]

[kouga00]

Hello, is it possible to access to request object in host param like this?

const proxy = require('express-http-proxy'); proxy((req, res) => req.proxyUrl)

[monkpow]

When the host argument is a function, that function is passed the req as the first and only parameter.

host(req) {
}

I'll update the docs.

[devalexqt]

Doc not updated!