Delete unmaintained CHANGELOG file
Delete unmaintained CHANGELOG file

Summary:
Since 1.0.0 we've been using the release notes instead of this file.
Closes https://github.com/facebook/relay/pull/1911

Reviewed By: wincent

Differential Revision: D5308611

Pulled By: kassens

fbshipit-source-id: 2780ab69e17e3addac11d27690785add46def1ab

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