feat(Icon): support rtl

Author: youluna

src/icon/index.jsx

@@ -20,7 +20,8 @@ class Icon extends Component {
          * 指定图标大小
          */
         size: PropTypes.oneOf(['xxs', 'xs', 'small', 'medium', 'large', 'xl', 'xxl', 'xxxl']),
-        className: PropTypes.string
+        className: PropTypes.string,
+        rtl: PropTypes.bool,
     };
 
     static defaultProps = {
@@ -31,7 +32,8 @@ class Icon extends Component {
     static _typeMark = 'icon';
 
     render() {
-        const { prefix, type, size, className, ...other } = this.props;
+        /* eslint-disable no-unused-vars*/
+        const { prefix, type, size, className, rtl, ...other } = this.props;
 
         const classes = cx({
             [`${prefix}icon`]: true,