chore[litemall-admin]: 更新webpack-dev-server版本

litemall-admin/package.json

@@ -96,7 +96,7 @@
     "webpack": "4.16.5",
     "webpack-bundle-analyzer": "2.13.1",
     "webpack-cli": "3.1.0",
-    "webpack-dev-server": "3.1.5",
+    "webpack-dev-server": "3.1.14",
     "webpack-merge": "4.1.4"
   },
   "engines": {