chore(package): update webpack to version 4.35.2

Closes #337

Author: greenkeeper[bot]

package.json

@@ -69,7 +69,7 @@
     "text-loader": "0.0.1",
     "wct-browser-legacy": "1.0.2",
     "web-component-tester": "6.9.2",
-    "webpack": "4.29.5",
+    "webpack": "4.35.2",
     "webpack-cli": "3.2.3",
     "webpack-dev-server": "3.1.14",
     "workbox-webpack-plugin": "3.6.3",