Add missing include for cref
Add missing include for cref

oxidase/node-osrm,oxidase/node-osrm,KnockSoftware/node-osrm,Project-OSRM/node-osrm,oxidase/node-osrm,KnockSoftware/node-osrm,Project-OSRM/node-osrm,KnockSoftware/node-osrm,KnockSoftware/node-osrm,Project-OSRM/node-osrm