Fix clone URL in README (repo now lives under sandstorm-io)
Fix clone URL in README (repo now lives under sandstorm-io)

jparyani/vagrant-spk,sandstorm-io/vagrant-spk,thejsj/vagrant-spk,dwrensha/vagrant-spk,ndarilek/vagrant-spk,dwrensha/vagrant-spk,thejsj/vagrant-spk,sandstorm-io/vagrant-spk,ndarilek/vagrant-spk,jparyani/vagrant-spk,sandstorm-io/vagrant-spk,kustomzone/vagrant-spk,ndarilek/vagrant-spk,dwrensha/vagrant-spk,kustomzone/vagrant-spk