message: fix browser keys
diff: "module": "./esm/index.js",
  "typings": "./esm/index.d.ts",
  "esnext": "./esm/index.js",
  - "browser": "dist/umd/index.js",
  - "browser:min": "dist/umd/index.min.js",
  + "browser": "./umd/index.js",
  + "browser:min": "./umd/index.min.js",
  "scripts": {
  "lint": "yarn tslint --project .",
  "clean": "yarn shx rm -rf dist output",
  