title: stagger() function not recognized in anime js
body: <p>I just started using animeJS and it's a nice library.</p>
  
  <p>However, I wanted to make use of the stagger function, as found in the documentation and my console is giving me the following message when I want to use the stagger function.</p>
  
  <p>"anime.stagger is not a function"</p>
  
  <p>So, I am wondering if the cdn that I am using might be outdated or I missed something else along the way. Otherwise the code I had, until wanting to use the stagger function, is working.</p>
  
  <pre><code>        &lt;!DOCTYPE html&gt;
      &lt;html lang="en"&gt;
      &lt;head&gt;
        &lt;meta charset="UTF-8"&gt;
        &lt;meta name="viewport" content="width=device-width, initial-scale=1.0"&gt;
        &lt;meta http-equiv="X-UA-Compatible" content="ie=edge"&gt;
        &lt;link rel="stylesheet" href="main.css"&gt;
        &lt;title&gt;Document&lt;/title&gt;
      &lt;/head&gt;
      &lt;body&gt;
  
        &lt;h1&gt;Design for Grid&lt;/h1&gt;
  
        &lt;section&gt;
          &lt;div&gt;&lt;/div&gt;
          &lt;div&gt;&lt;/div&gt;
          &lt;div&gt;&lt;/div&gt;
          &lt;div&gt;&lt;/div&gt;
          &lt;div&gt;&lt;/div&gt;
          &lt;div&gt;&lt;/div&gt;
          &lt;div&gt;&lt;/div&gt;
          &lt;div&gt;&lt;/div&gt;
          &lt;div&gt;&lt;/div&gt;
          &lt;div&gt;&lt;/div&gt;
        &lt;/section&gt;
  
  
  
  
        &lt;script src="https://cdnjs.cloudflare.com/ajax/libs/animejs/2.2.0/anime.js"&gt;&lt;/script&gt;
  
  
        &lt;script&gt; 
  
        let tl = anime.timeline({
          easing: 'easeOutExpo',
          duration: 750
        });
  
        //Add children
        tl.add({
          targets: 'section div',
          backgroundColor: 'rgb(111,193, 243)',
          delay: anime.stagger(300)
      })
  
  
          &lt;/script&gt;
        &lt;/body&gt;
      &lt;/html&gt;
  </code></pre>