remove old line about windows docker support
remove old line about windows docker support

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