title: skmaps huge memory leaks by updating SKAnnotation
body: <p>On the map I have placed annotations and I need to hide/show some of them.</p>
  
  <p>I use the same annotations and just call <code>mapView.updateAnnotation(annotation)</code> but every call for this function increases memory usage. </p>
  
  <p>Is there another way to achieve hiding/showing Annotation without recreating them and without memory leaks? </p>