Bumps [webpacker](https://github.com/rails/webpacker) from 4.0.4 to 4.0.5. - [Release notes](https://github.com/rails/webpacker/releases) - [Changelog](https://github.com/rails/webpacker/blob/master/CHANGELOG.md) - [Commits](https://github.com/rails/webpacker/compare/v4.0.4...v4.0.5)pull/4/head