message: docs: add author
diff: {
  "name": "@kintone/rest-api-client",
  "version": "0.0.1",
  + "author": {
  + "name": "Cybozu, Inc.",
  + "email": "",
  + "url": "https://cybozu.co.jp"
  + },
  "description": "Kintone REST API client for JavaScript",
  "main": "lib/index.js",
  "module": "esm/index.js",
  