Broken cluster example

[edent]

The cluster example at https://rawgit.com/mapbox/mapbox-gl-leaflet/master/examples/cluster.html doesn't work.

It is caused by this line:

mapbox-gl-leaflet/examples/cluster.html

Line 22 in df9c10c

<script src="https://www.mapbox.com/mapbox.js/assets/data/realworld.388.js"></script>

Are you happy for a PR to replace that with https://unpkg.com/leaflet.markercluster@1.0.0/example/realworld.388.js ?

[jgravois]

that'd be helpful. thanks.