Quick fix on demo readme
Quick fix on demo readme

Signed-off-by: TomSweeneyRedHat <tsweeney@redhat.com>

Closes: #737
Approved by: rhatdan

rhatdan/buildah,nalind/buildah,rhatdan/buildah,nalind/buildah-1,TomSweeneyRedHat/buildah,projectatomic/buildah,TomSweeneyRedHat/buildah,ipbabble/buildah,nalind/buildah-1,projectatomic/buildah,nalind/buildah,TomSweeneyRedHat/buildah,ipbabble/buildah,rhatdan/buildah,projectatomic/buildah,nalind/buildah-1