Relay: Create `yarn.lock` File
Relay: Create `yarn.lock` File

Summary: Keeping up with the cool kids: https://yarnpkg.com/

Reviewed By: josephsavona

Differential Revision: D4013880

fbshipit-source-id: 40b21310d93bbd8c08183c773699440bea275505

zpao/relay,facebook/relay,josephsavona/relay,kassens/relay,josephsavona/relay,freiksenet/relay,cpojer/relay,kassens/relay,wincent/relay,voideanvalue/relay,voideanvalue/relay,wincent/relay,xuorig/relay,apalm/relay,iamchenxin/relay,wincent/relay,facebook/relay,chirag04/relay,facebook/relay,atxwebs/relay,wincent/relay,apalm/relay,kassens/relay,yungsters/relay,chentsulin/relay,kassens/relay,benjaminogles/relay,iamchenxin/relay,freiksenet/relay,cpojer/relay,iamchenxin/relay,atxwebs/relay,voideanvalue/relay,kassens/relay,xuorig/relay,wincent/relay,chirag04/relay,xuorig/relay,cpojer/relay,voideanvalue/relay,facebook/relay,rosskevin/relay,voideanvalue/relay,yungsters/relay,benjaminogles/relay,atxwebs/relay,facebook/relay,cpojer/relay,josephsavona/relay,dbslone/relay,apalm/relay,freiksenet/relay,voideanvalue/relay,benjaminogles/relay,chentsulin/relay,facebook/relay,atxwebs/relay,xuorig/relay,chentsulin/relay,yungsters/relay,wincent/relay,chirag04/relay,kassens/relay,rosskevin/relay,xuorig/relay,zpao/relay,dbslone/relay,zpao/relay,iamchenxin/relay,xuorig/relay