update webpack to v3.5.4

package.json

@@ -63,7 +63,7 @@
     "vue-loader": "^11.3.4",
     "vue-resource": "^1.3.4",
     "vue-template-compiler": "^2.2.6",
-    "webpack": "^3.5.1",
+    "webpack": "^3.5.4",
     "webpack-bundle-analyzer": "^2.8.2",
     "webpack-stats-plugin": "^0.1.5"
   },

yarn.lock

@@ -6275,9 +6275,9 @@ webpack-stats-plugin@^0.1.5:
   version "0.1.5"
   resolved "https://registry.yarnpkg.com/webpack-stats-plugin/-/webpack-stats-plugin-0.1.5.tgz#29e5f12ebfd53158d31d656a113ac1f7b86179d9"
-webpack@^3.5.1:
-  version "3.5.1"
-  resolved "https://registry.yarnpkg.com/webpack/-/webpack-3.5.1.tgz#b749ee3d2b5a118dad53e8e41585b3f71e75499a"
+webpack@^3.5.4:
+  version "3.5.4"
+  resolved "https://registry.yarnpkg.com/webpack/-/webpack-3.5.4.tgz#5583eb263ed27b78b5bd17bfdfb0eb1b1cd1bf81"
   dependencies:
     acorn "^5.0.0"
     acorn-dynamic-import "^2.0.0"