message: fix clean script
diff: "scripts": {
  "test": "cross-env NODE_ENV=test karma start",
  "test:cov": "cross-env NODE_ENV=coverage karma start",
  - "clean": "del dist lib es coverage examples/build",
  + "clean": "del dist coverage examples/build",
  "lint": "eslint *.js src",
  "build": "run-p build:es build:cjs build:umd build:umd:min",
  "build:es": "cross-env NODE_ENV=es rollup -c",
  