Update package metadata and print release instructions

Usage:
  kue package publish [<package>] [options]

Options:
  --description, -d   Package description
  --version, -V       Package version (e.g. 0.2.0)
  --publisher, -p     Publisher name or organisation
  --keywords, -k      Comma-separated list of keywords
  --output, -o        Package directory (default: current directory)