Update common/shell/shell.go
Update common/shell/shell.go

be more descriptive
hashicorp/packer,bryson/packer,bryson/packer,rnaveiras/packer,grubernaut/packer,ricardclau/packer,rnaveiras/packer,dave2/packer,paulmey/packer,ricardclau/packer,timsutton/packer,mitchellh/packer,timsutton/packer,tas50/packer,ricardclau/packer,mitchellh/packer,tas50/packer,hashicorp/packer,pecigonzalo/packer,dave2/packer,paulmey/packer,bryson/packer,timsutton/packer,mitchellh/packer,hashicorp/packer,dave2/packer,pecigonzalo/packer,pecigonzalo/packer,paulmey/packer,bryson/packer,rnaveiras/packer,ricardclau/packer,rnaveiras/packer,paulmey/packer,paulmey/packer,dave2/packer,timsutton/packer,dave2/packer,tas50/packer,dave2/packer,paulmey/packer,ricardclau/packer,ricardclau/packer,tas50/packer,rnaveiras/packer,grubernaut/packer,grubernaut/packer,timsutton/packer,grubernaut/packer,pecigonzalo/packer,tas50/packer,tas50/packer,timsutton/packer,grubernaut/packer,hashicorp/packer,mitchellh/packer,rnaveiras/packer,bryson/packer,mitchellh/packer,bryson/packer,grubernaut/packer