title: Use google's autocomplete service to search (and output) only country and/or city
body: <p>I initialise google places api as follows:</p>
  
  <pre class="lang-html prettyprint-override"><code>&lt;script
        type="text/javascript"
        src="https://maps.googleapis.com/maps/api/js?key=API_KEY&amp;libraries=places&amp;types=cities"
      &gt;&lt;/script&gt;
  </code></pre>
  
  <p>and in my code, I bootstrap the service as follows:</p>
  
  <pre class="lang-js prettyprint-override"><code>const autocomplete = new window.google.maps.places.AutocompleteService();
  
  autocomplete.getPlacePredictions({ input }, predictions =&gt; {
   console.log(predictions);
  });
  
  autocomplete.getPlacePredictions('London');
  </code></pre>
  
  <p>I'd expect the query to only return a set of cities matching that query, but instead it returns a list of London based addresses.</p>
  
  <p>How could I make it return only city results matching that query?</p>