add more information to release doc
add more information to release doc

mitchellh/packer,rnaveiras/packer,rnaveiras/packer,mitchellh/packer,pecigonzalo/packer,rnaveiras/packer,rnaveiras/packer,ricardclau/packer,ricardclau/packer,ricardclau/packer,hashicorp/packer,pecigonzalo/packer,mitchellh/packer,mitchellh/packer,pecigonzalo/packer,ricardclau/packer,hashicorp/packer,rnaveiras/packer,hashicorp/packer,rnaveiras/packer,ricardclau/packer,mitchellh/packer,hashicorp/packer,pecigonzalo/packer,ricardclau/packer