Laravel v5.8.6 - v5.8.7 released

Laravel v5.8.6-v5.8.7 is released in 2019/03/21, here are the changes we`ve merged into this release.

#Fixed

• Fix: Locks acquired with block() are not immediately released if the callback fails (#27957)

#Changed

• Allowed retrieving env variables with getenv() (#27958, c37702c)
• Used stripslashes for Validation\Rules\Unique.php (#27940, 34759cc)

#Refactoring

• Refactoring of Illuminate\Http\Concerns::allFiles() (#27955)

GitHub: https://github.com/laravel/framework/compare/v5.8.5...v5.8.7