Update service endpoint
Update service endpoint

See: http://blog.airbrake.io/airbrake-news/airbrake-io/

felixge/node-airbrake,protonet/node-airbrake,miguelmota/node-airbrake,airbrake/node-airbrake,dylanahsmith/node-airbrake,sinsoku/node-airbrake,droppedoncaprica/node-airbrake