message: improvement - example:watch also "example" folder
diff: "clean": "rimraf dist",
  "build": "npm run clean && tsc",
  "example": "ts-node example/index.ts",
  - "example:watch": "nodemon --watch src --ext ts --ignore '*.spec.ts' --exec npm run example",
  + "example:watch": "nodemon --watch src --watch example --ext ts --ignore '*.spec.ts' --exec npm run example",
  "watch": "tsc -w",
  "lint": "tslint --config tslint.json --project tsconfig.json --type-check",
  "test": "NODE_ENV=test jest --expand",
  