Handling multiple forms on one page.

[louisl]

Thanks for this, may have found a minor flaw though. If you have multiple forms on one page it will only fill out the first form. To fix this I changed it to a loop.

// Changed...
document.querySelector('.g-recaptcha-response').value = token
// to...
var elements = document.querySelectorAll('.g-recaptcha-response');
for (var i = 0; i < elements.length; i++) {
    elements[i].value = token;
}

[ryangittings]

Would accept a PR for the README for this - super valid point!