Events fire not removed/replaced

[HumbleBeck]

• Lumen Version: 5.8.0
• PHP Version: 7.2.15
• Database Driver & Version:

Description:

fire method was removed from laravel 5.8 laravel/framework#26392, although its still in lumen
vendor/laravel/lumen-framework/src/helpers.php:202 which cause the error.

  Call to undefined method Illuminate\Events\Dispatcher::fire()

Steps To Reproduce:

upgrade lumen from 5.7 to 5.8
the easiest way to see error: php artisan make:migration create_something_table

[driesvints]

PR that fixes this was merged: https://github.com/laravel/lumen-framework/pull/888/files