title: Re-captcha v3 integration
body: <p>I'm trying to integrate <a href="https://developers.google.com/recaptcha/docs/v3" rel="nofollow noreferrer">reCaptcha V3</a></p>
  
  <p>what I tried is:</p>
  
  <pre><code>&lt;script defer="defer"
          type="text/javascript"
          src="https://www.google.com/recaptcha/api.js?onload=onloadCallback&amp;amp;render=6Lda2XgUAAAAAKxRqwe9zBL09zv2ja1DYV-r"&gt;
  &lt;/script&gt;
  &lt;script type="text/javascript"&gt;
      var onloadCallback = function(){
          grecaptcha.execute('6Lda2XgUAAAAAKxRaqwev2ja1DYV-r', {action: '/foo/bar/'}).then(function(token) {
              alert(token)
          });
      };
  &lt;/script&gt;
  </code></pre>
  
  <p>But on loading page I get <code>(index):1 Uncaught (in promise) null</code> Does somebody know the reason and how could i fix it?</p>
  
  <p>EDIT: I catched this error: </p>
  
  <pre><code>Uncaught TypeError: grecaptcha.execute(...).then(...).catch is not a function
      at onloadCallback ((index):18)
      at gf (recaptcha__pl.js:512)
      at Gj (recaptcha__pl.js:508)
      at recaptcha__pl.js:520
      at recaptcha__pl.js:539
  onloadCallback @ (index):18
  gf @ recaptcha__pl.js:512
  Gj @ recaptcha__pl.js:508
  (anonymous) @ recaptcha__pl.js:520
  (anonymous) @ recaptcha__pl.js:539
  (index):1 Uncaught (in promise) null
  </code></pre>