WOFF 转 WOFF2
把 WOFF 网页字体升级成 WOFF2，压缩率明显更好，页面加载也更快。
来自
To
WOFF
The original web font format — a compressed font wrapper made for fast delivery to browsers via CSS.
WOFF2
The modern web font standard. Noticeably smaller than WOFF and the format every current browser prefers.