message: fix main reference
diff: "version": "0.0.1-0",
  "description": "",
  "main": "umd/bundle.js",
  - "module": "umd/index.js",
  + "module": "es/index.js",
  "jsnext": "es/index.js",
  "typings": "es/index.d.ts",
  "scripts": {
  