Accessibility: Lists field in forms missing fieldset and legend

Hi,

Thanks for the handy plugin! Can you please make this fix to improve that accessibility of your forms?

The list field is missing a fieldset and legend, and has an orphaned label that is not associated with any field. This is the current code:

<div id="ic34d" class="gjs-row">
     <div class="gjs-cell">
          <label id="" class="es-field-label">What type of posts would you like to get notified about? (Required)</label>
          <div id="undefined" class="es-list">
               <div><label><input type="checkbox" class="pl-6 form-checkbox " name="esfpx_lists[]" value="ac95f3d9ac71"><span>WordPress</span></label></div>
               <div><label><input type="checkbox" class="pl-6 form-checkbox " name="esfpx_lists[]" value="c4dfe0f151fc"><span>Business</span></label></div>
               <div><label><input type="checkbox" class="pl-6 form-checkbox " name="esfpx_lists[]" value="c1e876a12681"><span>Life/Personal</span></label></div>
          </div>
     </div>
</div>

This is what it should be:

<fieldset id="ic34d" class="gjs-row">
     <div class="gjs-cell">
          <legend id="" class="es-field-label">What type of posts would you like to get notified about? (Required)</legend>
          <div id="undefined" class="es-list">
               <div><label><input type="checkbox" class="pl-6 form-checkbox " name="esfpx_lists[]" value="ac95f3d9ac71"><span>WordPress</span></label></div>
               <div><label><input type="checkbox" class="pl-6 form-checkbox " name="esfpx_lists[]" value="c4dfe0f151fc"><span>Business</span></label></div>
               <div><label><input type="checkbox" class="pl-6 form-checkbox " name="esfpx_lists[]" value="c1e876a12681"><span>Life/Personal</span></label></div>
          </div>
     </div>
</fieldset>

The fieldset is necessary for screen reader users to understand how fields are grouped and is required for conformance with Web Content Accessibility Guidelines. Fixing this would be a big improvement for all websites using your plugin. Thank you!