title: Not able to render the infoWindow in react-google-maps
body: <p>I was trying to add an InfoWindow to the mid point of a polyline. </p>
  
  <p>This is my code for displaying the infoWindow.</p>
  
  <pre><code>&lt;InfoWindow
     position={this.state.windowPosition}
     onCloseclick={this.toggleInfoWindow}
     options={{pixelOffset: new google.maps.Size(0,-30)}}
  &gt;
         &lt;p&gt;iggd&lt;/p&gt;
  &lt;/InfoWindow&gt;
  </code></pre>
  
  <p>windowPosition here is the lat and lng of the midpoint of the polyline.
  When I try to run this  I am getting an error saying that <code>You must provide either an anchor (typically render it inside a &lt;Marker&gt;) or a position props for &lt;InfoWindow&gt;</code>. But the owner of the repo said that <a href="https://github.com/tomchentw/react-google-maps/issues/333" rel="nofollow noreferrer"> (link's here)</a> we can render an infoWindow where ever we want if we pass a position as props which I am doing. </p>
  
  <p>Any help is appreciated.</p>