appveyor: remove verbose mode as output is truncated, and I can't see what's wrong
appveyor: remove verbose mode as output is truncated, and I can't see what's wrong

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