title: How to change expansion panel icon position to the left?
body: <p>In my app, the expansion arrow has to be in the left side of the panel.
  But, by default it's displaying in the right side. </p>
  
  <p>This : </p>
  
  <pre><code>&lt;ExpansionPanelSummary
      className={classes.panelSummary}
      expandIcon={&lt;ExpandMoreIcon /&gt;}
      IconButtonProps={{edge: 'start'}}
      aria-controls='panel1a-content'
      id='panel1a-header'
  &gt;
  </code></pre>
  
  <p>Doesn't made it.</p>