contrib: add version-bump helper script
contrib: add version-bump helper script

danielfm/coreos-kubernetes,chen-anders/coreos-kubernetes,IDKA/coreos-kubernetes,chen-anders/coreos-kubernetes,turbonomic/coreos-kubernetes,IDKA/coreos-kubernetes,ah45/coreos-kubernetes,turbonomic/coreos-kubernetes,chen-anders/coreos-kubernetes,danielfm/coreos-kubernetes,coreos/coreos-kubernetes,joshix/coreos-kubernetes,ah45/coreos-kubernetes,limres/coreos-kubernetes,bnea-engineering/coreos-kubernetes,coreos/coreos-kubernetes,danielfm/coreos-kubernetes,limres/coreos-kubernetes,turbonomic/coreos-kubernetes,limres/coreos-kubernetes,bnea-engineering/coreos-kubernetes,joshix/coreos-kubernetes,bnea-engineering/coreos-kubernetes,ah45/coreos-kubernetes,IDKA/coreos-kubernetes