chore(package): update webpack to version 4.42.1

Closes #169

Author: greenkeeper[bot]

package.json

@@ -21,7 +21,7 @@
     },
     "devDependencies": {
         "copy-webpack-plugin": "4.5.3",
-        "webpack": "4.29.6",
+        "webpack": "4.42.1",
         "webpack-cli": "3.1.2",
         "webpack-dev-server": "3.2.1"
     }