Document support for versioned boxes
Document support for versioned boxes

mmv-ru/vagrant-mutate,sciurus/vagrant-mutate,beddari/vagrant-mutate,josephglanville/vagrant-mutate,sciurus/vagrant-mutate,tsibley/vagrant-mutate,mmv-ru/vagrant-mutate,swills/vagrant-mutate,tsibley/vagrant-mutate,swills/vagrant-mutate,josephglanville/vagrant-mutate,beddari/vagrant-mutate