cascader add disabled attribute

Author: sunxiaoyu

package.json

@@ -1,6 +1,6 @@
 {
     "name": "santd",
-    "version": "0.3.7",
+    "version": "0.3.8",
     "description": "san UI design",
     "scripts": {
         "start": "cross-env NODE_ENV=development node scripts/preview.js",

src/cascader/index.js

@@ -273,6 +273,7 @@ export default san.defineComponent({
             popupPlacement="{{popupPlacement}}"
             options="{{inputValue ? filteredOptions : options}}"
             value="{{value}}"
+            disabled="{{disabled}}"
             visible="{{popupVisible}}"
             on-visibleChange="handlePopupVisibleChange"
             on-change="handleChange"