message: build: drop Node v4 from engines in package.json
diff: "version": "0.7.1",
  "author": "Teppei Sato <teppeis@gmail.com>",
  "engines": {
  - "node": ">=4"
  + "node": ">=6"
  },
  "main": "src/index.js",
  "bin": {
  "site:test": "mocha site/test --require site/test/setup.js",
  "test": "run-s eslint mocha site:test"
  },
  - "husky": {
  - "hooks": {
  - "pre-commit": "npm test && npm run site && git add docs"
  - }
  - },
  "dependencies": {
  "@teppeis/kintone-plugin-manifest-validator": "^0.6.1",
  "debug": "^3.1.0",
  "url": "ssh://git@github.com/teppeis/kintone-plugin-packer.git"
  },
  "bugs": "https://github.com/teppeis/kintone-plugin-packer/issues",
  + "husky": {
  + "hooks": {
  + "pre-commit": "npm test && npm run site && git add docs"
  + }
  + },
  "keywords": [
  "kintone"
  ],
  