foundation-sites 6.4.0 rc2 发布了，foundation-sites 是世界上先进的响应前端框架，它可以快速地从模板转变成成品，构建网站或者应用程序，可通过 Foundation 在任何类型的设备上正常使用。
更新内容：
Update grid classes to use .grid-x and .grid-y rather than .grid and .grid-vertical. Eliminates separate "vertical" classes on cell level, having all inherit from the grid above it. See #10118
Fix a bug in Motion UI Javascript. See #10110 (thanks @swey!)
Add foundation-prototype.css as a build with prototyping classes enabled to dist.
