fix(deps): update dependency webpack to v4.47.0 (#304)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

package.json

@@ -52,7 +52,7 @@
     "svgo": "1.3.2",
     "svgstore-cli": "1.3.2",
     "sw-toolbox": "3.6.0",
-    "webpack": "4.36.1",
+    "webpack": "4.47.0",
     "webpack-stream": "4.0.3"
   },
   "engines": {