title: Google-maps-react marker not showing InfoWindow onClick
body: <p>When I click the google maps marker, it registers the click but I cant appear to get the InfoWindow to appear after the state change. </p>
  
  <p>Tried setting/reading from an updated state on click</p>
  
  <p>'''react</p>
  
  <pre><code>import React from 'react';
  import {Map, InfoWindow, Marker, GoogleApiWrapper} from 'google-maps-react'; 
  
  export class BathroomMap extends React.Component{
  
  constructor(props){
      super(props);
      this.state = {
          gmapsAPI: "https://maps.googleapis.com/maps/api/js?key="+ this.API_KEY +"&amp;callback=initMap",
          center: {
              lat: 40.7367,
              lng: -73.9899
            },
          zoom: 15,
          showingInfoWindow: false,
          activeMarker: {},
          selectedPlace: {},
          infoWindowOpen: false,
      }
  
      this.handleToggleOpen = this.handleToggleOpen.bind(this);
  }
  
  handleToggleOpen = () =&gt; {
      console.log("Marker Clicked");
      this.setState({
         infoWindowOpen: !this.state.infoWindowOpen,
      });
  }
  
  render() {
      return (
  
              &lt;Map google={window.google} zoom={14} initialCenter={this.state.center}&gt;
                  &lt;Marker onClick={this.handleToggleOpen}
                      name={'Current location'} /&gt;
                  &lt;InfoWindow open={this.state.infoWindowOpen} onClose={this.onInfoWindowClose}&gt;
                      &lt;div&gt;
                          &lt;h1&gt;Marker Info Placeholder&lt;/h1&gt;
                      &lt;/div&gt;
                  &lt;/InfoWindow&gt;
              &lt;/Map&gt;
  
      );
  }
  }
  
  BathroomMap = GoogleApiWrapper({
    apiKey: (/*Omitted*/)
  })(BathroomMap)
  </code></pre>
  
  <p>'''</p>
  
  <p>I expected google map marker with some sort of InfowWindow to appear but instead the infowWindowOpened returns undefined</p>