Research into swapping `Zend\Diactoros\ServerRequest` with `Slim\Http\Request`

[NigelGreenway]

It seems like this is the better solution as it is all native to SlimPHP, but is this the right right to go, as they both use the PSR interface it should be simple to swap out and remove the non-required dependancy of Zend\Diactoros?

$slimRequest = new Request(
    $request->getMethod(),
    Uri::createFromString(
         $request->getPath() . '?' . http_build_query($request->getQueryParams())
    ),
    new Headers($request->getHeaders()),
    SlimCookies::parseHeader($request->getHeader('Cookie')),
    [],
    $stream,
    []
);