Add moment dep documentation

docs/react/introduce.en-US.md

@@ -69,6 +69,8 @@ We provide `antd.js` `antd.css` and `antd.min.js` `antd.min.css` under `antd/dis
 
 > **We strongly discourage loading the entire files** this will add bloat to your application and make it more difficult to receive bugfixes and updates. Antd is intended to be used in conjunction with a build tool, such as [webpack](https://webpack.github.io/), which will make it easy to import only the parts of antd that you are using.
 
+> Note: you should import moment before using antd.js after `3.0`.
+
 ## Usage
 
 ```jsx

docs/react/introduce.zh-CN.md

@@ -70,6 +70,8 @@ $ yarn add antd
 
 > **强烈不推荐使用已构建文件**，这样无法按需加载，而且难以获得底层依赖模块的 bug 快速修复支持。
 
+> 注意：3.0 之后引入 antd.js 前你需要自行引入 [moment](http://momentjs.com/)。
+
 ## 示例
 
 ```jsx