update: 升级element

package.json

@@ -24,7 +24,7 @@
     "awesome-phonenumber": "^2.27.0",
     "babel-polyfill": "^6.26.0",
     "draggable": "^4.2.0",
-    "element-ui": "^2.13.2",
+    "element-ui": "^2.15.6",
     "exif-js": "^2.3.0",
     "file-saver": "^1.3.8",
     "html2canvas": "^1.0.0-alpha.12",