chore(package): updated webpack to 4.28.3

Author: AnthonyNahas

package-lock.json

@@ -109,7 +109,7 @@
     "tsickle": "^0.34.0",
     "tslint": "~5.11.0",
     "typescript": "~3.1.6",
-    "webpack": "^4.28.2",
+    "webpack": "^4.28.3",
     "webpack-dev-middleware": "^3.4.0",
     "webpack-dev-server": "^3.1.14",
     "yargs": "^12.0.5",