Zombie.js options not permitted any more?

I am making a simple testing script using Node.js and Zombie.js for a website of mine. I wanted to make it so that the 'visits' are comming from chrome:

var UA = "Mozilla/5.0 (Windows NT 6.1) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/41.0.2228.0 Safari/537.36"

setInterval(function () {
        browser.visit('/', {userAgent: UA}, function(err) {
                assert.ifError(err);
        });
}, 1000);

This seems to work but the problem is that for every request made I get this error in the console:

visit with options is deprecated and will be removed soon

Now, is there a more 'correct' way to do this with Zombie.js? Or, is there another option for me to use (like Phantomjs perjhaps)?

Any ideas?