title: react-bootstrap popover not showing (while tooltip is ok)
body: <p>My Popover component is never shown.
  Same code with Tooltip is ok (but I need a popover...)</p>
  
  <p>My code : </p>
  
  <pre><code>&lt;OverlayTrigger 
     placement="right" 
     trigger="hover" 
     key="overlay-1" 
     overlay={&lt;Tooltip id="tooltip1"&gt;Test&lt;/Tooltip&gt;}
   &gt;
     &lt;label className="col-1"&gt;Journée&lt;/label&gt;
  &lt;/OverlayTrigger&gt;
  </code></pre>
  
  <p>this one is ok (tooltip) while the next is not working :</p>
  
  <pre><code>&lt;OverlayTrigger 
       placement="right" 
       trigger="hover" 
       key="overlay-1"
       overlay={&lt;Popover id="popover-basic" title="Popover right"&gt;Test&lt;/Popover&gt;}
   &gt;
     &lt;label className="col-1"&gt;Journée&lt;/label&gt;
  &lt;/OverlayTrigger&gt;
  </code></pre>