1. update webpack version.

package.json

@@ -12,7 +12,6 @@
   "engines": {
     "install-node": "6.9.2"
   },
-  "sideEffects": false,
   "dependencies": {
     "@babel/runtime": "^7.0.0-beta.44",
     "antd": "^3.3.0",
@@ -120,7 +119,7 @@
     "style-loader": "^0.20.3",
     "uglifyjs-webpack-plugin": "^1.2.4",
     "url-loader": "^1.0.1",
-    "webpack": "^4.5.0",
+    "webpack": "^4.6.0",
     "webpack-bundle-analyzer": "^2.11.1",
     "webpack-cli": "^2.0.14",
     "webpack-dev-server": "^3.1.3",