Bump @rails/webpacker from 3.2.1 to 3.4.1

Bumps [@rails/webpacker](https://github.com/rails/webpacker) from 3.2.1 to 3.4.1.
- [Release notes](https://github.com/rails/webpacker/releases)
- [Changelog](https://github.com/rails/webpacker/blob/master/CHANGELOG.md)
- [Commits](rails/webpacker@v3.2.1...v3.4.1)

Signed-off-by: dependabot[bot] <support@dependabot.com>

package.json

@@ -14,7 +14,7 @@
   },
   "repository": "github:marceloalves/swrpg-hooks",
   "dependencies": {
-    "@rails/webpacker": "^3.2.1",
+    "@rails/webpacker": "^3.4.1",
     "babel-preset-react": "^6.24.1",
     "coffeescript": "2.2.4",
     "moment": "^2.21.0",