updated README.md regarding mobile online usage
updated README.md regarding mobile online usage

ammagamma/graphhopper,don-philipe/graphhopper,routexl/graphhopper,graphhopper/graphhopper,don-philipe/graphhopper,routexl/graphhopper,graphhopper/graphhopper,ammagamma/graphhopper,fbonzon/graphhopper,devemux86/graphhopper,boldtrn/graphhopper,routexl/graphhopper,boldtrn/graphhopper,fbonzon/graphhopper,routexl/graphhopper,fbonzon/graphhopper,fbonzon/graphhopper,devemux86/graphhopper,graphhopper/graphhopper,boldtrn/graphhopper,don-philipe/graphhopper,don-philipe/graphhopper,boldtrn/graphhopper,ammagamma/graphhopper,graphhopper/graphhopper,ammagamma/graphhopper,devemux86/graphhopper,devemux86/graphhopper