chore(package): update js-yaml to version 3.8.1
chore(package): update js-yaml to version 3.8.1

https://greenkeeper.io/
edpop/iD,openstreetmap/iD,AndreasHae/iD,1ec5/iD,mapmeld/iD,digidem/iD,ngageoint/hootenanny-ui,kartta-labs/iD,bagage/iD,bagage/iD,edpop/iD,edpop/iD,AndreasHae/iD,bagage/iD,digidem/iD,morray/iD,1ec5/iD,1ec5/iD,kartta-labs/iD,morray/iD,mapmeld/iD,ngageoint/hootenanny-ui,ngageoint/hootenanny-ui,AndreasHae/iD,kartta-labs/iD,mapmeld/iD,openstreetmap/iD,openstreetmap/iD