title: Trigger a event when the moving marker reaches a certain latlng
body: <p>I am Using <a href="https://github.com/ewoken/Leaflet.MovingMarker" rel="nofollow noreferrer">this</a> plugin for moving a marker around a polyline.</p>
  
  <p>Here is how the moving marker is initiated.</p>
  
  <pre><code>var locations = [
    ["LOCATION_1",25.700769, 82.300140],
    ["LOCATION_2",26.600969, 83.400260],
    ["LOCATION_3",27.600969, 84.400260],
    ["LOCATION_4",28.600969, 85.400260],
    ["LOCATION_5",29.600969, 86.400260],
    ["LOCATION_6",24.600969, 87.400260],
    ["LOCATION_7",23.500969, 88.200260],
    ["LOCATION_8",22.400969, 89.300260],
    ["LOCATION_9",25.700569, 90.400000]
  ];
  
  var latlng = array();
  
  for (var i = 0; i &lt; locations.length; i++) {
    latlngs.push([locations[i][1],locations[i][2]]);
  }
  
  var myMovingMarker = L.Marker.movingMarker(latlngs,
    [2500,4000,2000,5000,4000,5000,3000,2000,4000], {
    autostart: true
  });
  </code></pre>
  
  <p>I want to popup a message every time the marker reaches the coordinates in  <code>locations</code> array.
  Is there any way to trigger a event whenever the marker reaches a certain <code>latlng</code> coordiantes ?</p>
  
  <p>Or is there any other way to bind a popup when the marker reacches a certain point.</p>