message: add mocha as dev dependency
  to make `npm test` work out of the box
diff: },
  "homepage": "https://github.com/jovotech/jovo-cli#readme",
  "devDependencies": {
  + "chai": "^4.1.2",
  "eslint": "^3.19.0",
  "eslint-config-google": "^0.8.0",
  - "chai": "^4.1.2",
  + "mocha": "^5.1.1",
  "nodemon": "^1.12.1"
  }
  }
  