message: docs: add keywords
diff: "lib",
  "umd"
  ],
  - "keywords": [],
  - "author": "",
  + "keywords": [
  + "kintone",
  + "rest",
  + "api-client"
  + ],
  "license": "MIT",
  "bugs": {
  "url": "https://github.com/kintone/js-sdk/issues"
  