title: Toggle icon not appearing on React-Accessible-Accordion
body: <p>I am implementing React-accessible-accordion in my React application.The click functionality is working fine however, I do not see the arrow icon appearing on the accordion. I tried to compare it with the DOM structure shown in the example in npm and I see the div for the icon itself is not getting added to my DOM.</p>
  
  <p>My code-</p>
  
  <p>import React from 'react';
  import ReactDOM from 'react-dom';</p>
  
  <p>import {
      Accordion,
      AccordionItem,
      AccordionItemTitle,
      AccordionItemBody,
  } from 'react-accessible-accordion';</p>
  
  <p>import 'react-accessible-accordion/dist/fancy-example.css';
  import 'react-accessible-accordion/dist/minimal-example.css';</p>
  
  <pre><code>&lt;div className="container"&gt;
                      &lt;Accordion&gt;
                      &lt;AccordionItem&gt;
                          &lt;AccordionItemTitle&gt;
                              &lt;h4&gt;Hello, This is me..&lt;/h4&gt;
                          &lt;/AccordionItemTitle&gt;
                          &lt;AccordionItemBody&gt;
                            Some Text
                          &lt;/AccordionItemBody&gt;
                      &lt;/AccordionItem&gt;
                  &lt;/Accordion&gt;
                  &lt;/div&gt;
  </code></pre>
  
  <p>The arrow icon comes from the </p>
  
  <pre><code>&lt;div class="accordion__arrow" role="presentation"&gt;&lt;/div&gt;
  </code></pre>
  
  <p>and this is not getting added for me. Any reason why is that happening. I am using the exact demo code shown in on npm site.</p>
  
  <p>Link I have referred-</p>
  
  <pre><code>https://www.npmjs.com/package/react-accessible-accordion
  </code></pre>
  
  <p>In my knowledge, the only thing I have not added is,</p>
  
  <pre><code>document.querySelector('[data-mount]')
  </code></pre>
  
  <p>Is that the reason my arrow icons are not loading?
  I am not sure if this is an open bug but the examples shown has these icons in each of the accordion.</p>