title: Leaflet - Feature data does not update in realtime
body: <p>Good evening, I have a problem with leaflet-realtime, updating the coordinates, the icon moves on the map, however if the values ​​in the properties on the map change and in the popup they do not change.
  Ex.
  The rotation of the marker does not change, speed data does not change. etc..</p>
  <p>Here is the code I wrote:</p>
  <pre><code>var map = L.map('map', {minZoom: 3, maxZoom: 18});
  L.Control.measureControl().addTo(map);
  mapLink = 'Esri';
  wholink = 'i-cubed, USDA, USGS, AEX, GeoEye, Getmapping, Aerogrid, IGN, IGP, UPR-EGP, and the GIS User Community';
  L.tileLayer('http://server.arcgisonline.com/ArcGIS/rest/services/World_Imagery/MapServer/tile/{z}/{y}/{x}', {
  attribution: '© '+mapLink+', '+wholink,
  maxZoom: 18,
  }).addTo(map);
  
  var shipLayer = L.layerGroup();
  
  var realtime = L.realtime(
  {
  url: 'http://localhost/api/xxx/',
  crossOrigin: true,
  type: 'json',
  },
  {
  interval: 2 * 1000,
  getFeatureId: function(featureData){
  return featureData.properties.idRisorsa;
  },
  pointToLayer: function (feature, latlng) {
  var track = L.icon({
  iconUrl: 'https://localhost' + feature.properties.TipoRisorsa + '.png',
  iconSize: [30, 30]
  });
  tracker = L.marker(latlng, {icon: track, rotationAngle: feature.properties.Angolo, title: feature.properties.NomePilota + &quot; &quot; + feature.properties.MarcaDrone} );
  tracker.bindPopup('Id: ' + feature.properties.idRisorsa +
  '
  Angolo: ' + feature.properties.Angolo +
  '
  Nome:' + feature.properties.NomePilota +'' +
  '
  Marca:' + feature.properties.MarcaDrone +
  '
  Coordinate: ' + latlng);
  tracker.addTo(shipLayer);
  return tracker;
  }}).addTo(map);
  
  realtime.on('update', function() {realtime.getBounds(), {maxZoom: 18};});
  map.setView([0, 0], 0);
  </code></pre>