update icon stateless component

components/icon/index.jsx

@@ -1,9 +1,7 @@
 import React from 'react';
 
-function Icon(props) {
+export default props => {
-  let {type, className = '', ...other} = props;
+  let { type, className = '', ...other } = props;
   className += ` anticon anticon-${type}`;
   return <i className={className} {...other} />;
-}
+};
-
-export default Icon;