Update notebook

notebooks/{gps_track.ipynb → gps_trace.ipynb}

@@ -19,6 +19,7 @@
     "m.add_basemap(\"Satellite\")\n",
     "m.add_basemap(\"OpenStreetMap.Mapnik\", visible=False)\n",
     "m.add_overture_buildings(visible=False)\n",
+    "m.add_layer_control()\n",
     "m"
    ]
   }