chore(package): update webpack to version 4.6.0

Author: greenkeeper[bot]

package.json

@@ -105,7 +105,7 @@
     "travis-status": "2.0.0",
     "tslint": "5.7.0",
     "typescript": "2.4.2",
-    "webpack": "4.5.0",
+    "webpack": "4.6.0",
     "webpack-dev-middleware": "3.1.2",
     "webpack-dev-server": "3.1.3",
     "yargs": "11.0.0",