Feature: Update Socket dependency to support hosts file on all platforms
(#108 by @clue)

This means that HTTP requests to hosts such as localhost will now work as
expected across all platforms with no changes required:

$client = new Client($loop);
$request = $client->request('GET', 'http://localhost/');
$request->on('response', function (Response $response) {
    // …
});
$request->end();