feat: upgrade to webpack 4

BREAKING CHANGE: Upgrade wepback 4, all webpack option
modifications must be webpcak 4 compatible. Drop support
for webpack plugins that do not work with v4 or above.

Author: yyx990803

package.json

@@ -21,8 +21,8 @@
   },
   "homepage": "https://github.com/vuejs/vue-cli/packages/@vue/eslint-config-standard#readme",
   "dependencies": {
-    "eslint-config-standard": "^11.0.0",
-    "eslint-plugin-import": "^2.9.0",
+    "eslint-config-standard": "^12.0.0-alpha.0",
+    "eslint-plugin-import": "^2.11.0",
     "eslint-plugin-node": "^6.0.1",
     "eslint-plugin-promise": "^3.7.0",
     "eslint-plugin-standard": "^3.1.0"