Add redirects

[jcubic]

In orinal article code there is:

resolve(Response.redirect(url + '/', 301));

The library should be able to do that.

Possible API:

app.get('/something', (req, res) => {
  res.redirect(`${req.url}/`, 301);
});

TODO:

• [ ] Test infinite redirects
• [ ] Test redirects for different domain/scope