Laravel v5.8.4 is released in 2019/03/12, here are the changes we`ve merged into this release.

Added

• Added Illuminate\Support\Collection::join() method (#27723)
• Added Illuminate\Foundation\Http\Kernel::getRouteMiddleware() method (#27852)
• Added danish specific transliteration to Str class (#27857)

Fixed

• Fixed JSON boolean queries (#27847)

GitHub:https://github.com/laravel/framework/releases/tag/v5.8.4