Add alternatives option to example
Add alternatives option to example

rossanag/leaflet-routing-machine,AW-UC/leaflet-routing-machine,martinboehm/leaflet-routing-machine,rossanag/leaflet-routing-machine,AW-UC/leaflet-routing-machine,wbg/leaflet-routing-machine,ngonzalez/leaflet-routing-machine,ngonzalez/leaflet-routing-machine,wbg/leaflet-routing-machine,wbg/leaflet-routing-machine,AW-UC/leaflet-routing-machine,ngonzalez/leaflet-routing-machine,martinboehm/leaflet-routing-machine,rossanag/leaflet-routing-machine,martinboehm/leaflet-routing-machine