title: How to add a marker in Vue2-Leaflet with the popup initially open
body: <p>When adding a marker dynamically, how to set the pop up as initially open?</p>
  
  <pre><code>&lt;v-map&gt;
    &lt;v-marker v-for="item in markers" :key="item.id" :lat-lng="item.latlng"&gt;
      &lt;v-popup :content="item.content"&gt;&lt;/v-popup&gt;
    &lt;/v-marker&gt;
  &lt;/v-map&gt;
  </code></pre>
  
  <p>Example here: <a href="http://jsfiddle.net/manelclos/f7dksf2m/" rel="nofollow noreferrer">http://jsfiddle.net/manelclos/f7dksf2m/</a></p>