build(deps-dev): bump webpack from 4.35.0 to 4.39.3

Bumps [webpack](https://github.com/webpack/webpack) from 4.35.0 to 4.39.3.
- [Release notes](https://github.com/webpack/webpack/releases)
- [Commits](webpack/webpack@v4.35.0...v4.39.3)

Signed-off-by: dependabot-preview[bot] <[email protected]>

Author: dependabot-preview[bot]

package.json

@@ -50,7 +50,7 @@
     "shx": "^0.3.2",
     "source-map-loader": "^0.2.4",
     "typescript": "3.4.5",
-    "webpack": "^4.35.0",
+    "webpack": "^4.39.3",
     "webpack-cli": "^3.3.8",
     "webpack-dev-server": "^3.8.0"
   }