Bump laravel-mix from 5.0.4 to 5.0.5

Bumps [laravel-mix](https://github.com/JeffreyWay/laravel-mix) from 5.0.4 to 5.0.5.
- [Release notes](https://github.com/JeffreyWay/laravel-mix/releases)
- [Commits](laravel-mix/laravel-mix@v5.0.4...v5.0.5)

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

Author: dependabot-preview[bot]