Fix travis tests by unmocking prop-types
Fix travis tests by unmocking prop-types

Summary: Closes https://github.com/facebook/relay/pull/1662

Reviewed By: leebyron

Differential Revision: D4925464

Pulled By: kassens

fbshipit-source-id: 0b883966b3803ddbf8c53319d2d535ba47ecddce

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