example(3dtiles_25d): change data url

Author: mgermerie

examples/3dtiles_25d.html

@@ -85,8 +85,8 @@
                 '3d-tiles-layer-building', {
                     name: 'Lyon-2015-building',
                     source: new itowns.C3DTilesSource({
-                        url:
-                            'http://rict.liris.cnrs.fr/DataStore/Lyon1er-2015/tileset.json',
+                        url: 'https://raw.githubusercontent.com/iTowns/iTowns2-sample-data/master/' +
+                            '3DTiles/mesh-lyon-2015/tileset.json',
                     }),
                 }, view);