Happy New Year 2017 🎉
- No longer support Node.js v4.x, use v6.0+
- Convert callback APIs to promises(StyleStats#parse())
- Drop test specs feature
- Drop Handlebars（no longer support custom/markdown/html formats）
- Add prettify flag and function #106
- Rewrite some code in ES6
- Update module dependencies
- Use ava test runner instead of mocha