Updating configuration on new instance not working

[zangrossig]

I'm trying to change the progress bar color after a user click, but even if I create a new instance of ldBar, I have no success:

    $(document).ready(function () {
        let p2 = new ldBar('#p2', {
            'preset': 'circle',
            'stroke': 'red'
        });
        p2.set(50, false);

        $('.btn-test').on('click', function () {

            let n = Math.floor(Math.random() * 100);
            p2 = new ldBar('#p2', {
                'stroke': 'green'
            });
            p2.set(n, false);
        });
    });

Is there a way to change configuration after the instance has been created?

Thank you for this great library!