title: cannot removeClass("d-none") in bootstrap 4
body: <p>Can I removeClass("d-none") using javascript?</p>
  
  <p>I have following code:</p>
  
  <pre><code>&lt;div id="progressBar" class="progress d-none"&gt;
        &lt;div class="progress-bar" role="progressbar" aria-valuenow="0"
    aria-valuemin="0" aria-valuemax="100" style="min-width: 2em; width:0%"&gt;
        &lt;/div&gt;
  &lt;/div&gt;
  </code></pre>
  
  <p>Using javascript I want to show the element so I used:</p>
  
  <pre><code>$("#progressBar").removeClass("d-none")
  </code></pre>
  
  <p>However this is not working. Should this work in Bootstrap 4? In bootstrap 3 I was using class "hidden" instead of class "d-none"</p>
  
  <pre><code>$("#progressBar").removeClass("hidden")
  </code></pre>
  
  <p>Was working fine.</p>