message: add module and unpkg fields in package.json
diff: "name": "vee-validate",
  "version": "2.0.0-rc.14",
  "description": "Simple Vue.js input validation plugin",
  + "module": "dist/vee-validate.esm.js",
  + "unpkg": "dist/vee-validate.js",
  "main": "dist/vee-validate.js",
  "typings": "types/index.d.ts",
  "homepage": "http://vee-validate.logaretm.com",
  