chore(package): update webpack-dev-server to version 3.1.6 (#336)

package.json

@@ -95,7 +95,7 @@
     "underscore-template-loader": "^1.0.0",
     "webpack": "^4.15.1",
     "webpack-cli": "^3.0.8",
-    "webpack-dev-server": "3.1.5",
+    "webpack-dev-server": "3.1.6",
     "webpack-merge": "^4.1.2",
     "webpack-visualizer-plugin": "^0.1.11"
   },