title: Material-UI Accordion (formerly ExpansionTable) component won't import
body: <p>I am building an app using <code>Material-UI</code>, so far so good.
  I am trying to build a component using an <code>Accordion</code> component, but i am getting an error when trying to import it:</p>
  <pre><code>Module not found: Can't resolve '@material-ui/core/Accordion' in [path]
  </code></pre>
  <p>I have tried to import it both through a default and named imports, but the result is the same.</p>
  <p>the component:</p>
  <pre><code>import React from 'react';
  //  import {
  //     Accordion,
  //     AccordionSummary,
  //     AccordionDetails
  //  } from '@material-ui/core';
  import Accordion from '@material-ui/core/Accordion';
  import AccordionSummary from '@material-ui/core/AccordionSummary';
  import AccordionDetails from '@material-ui/core/AccordionDetails';
  import ExpandMoreIcon from '@material-ui/icons/ExpandMore';
  
  
  const JobCard = () =&gt; {
  
      return(
          &lt;Accordion expanded={true}&gt;
              &lt;AccordionSummary
                  expandIcon={&lt;ExpandMoreIcon /&gt;}
              &gt;
                  test
              &lt;/AccordionSummary&gt;
              &lt;AccordionDetails&gt;
                  test
              &lt;/AccordionDetails&gt;
          &lt;/Accordion&gt;
      );
  }
  
  export default JobCard;
  </code></pre>
  <p>All my other components are working fine with imported Material-UI components.</p>
  <p>Am i missing something here that i am doing wrong? Did anyone encounter such an issue?</p>