message: docs: README tiny fix
diff: kintone-plugin-packer
  ====
  -[kintone plugin package.sh](https://github.com/kintone/plugin-sdk) for JavaScript
  +[kintone plugin package.sh](https://github.com/kintone/plugin-sdk) in JavaScript
  [![npm version][npm-image]][npm-url]
  ![Node.js Version Support][node-version]
  