message: added missing "yo" peer dep
diff: "generator-feathers": "^0.6.20",
  "generator-feathers-plugin": "^0.6.9",
  "vorpal": "^1.10.9",
  - "yeoman-environment": "^1.5.2"
  + "yeoman-environment": "^1.5.2",
  + "yo": "^1.7.0"
  },
  "devDependencies": {
  "babel-cli": "^6.6.5",
  