Prepare for laravel 8 support

[lloricode]

No description provided.

[Swop]

Any news on this @andersao ?
Thanks!

[masroore]

In the meantime, you can use this repo:
https://github.com/masroore/laravel-validation

In your composer.json file:

  "repositories": [
      { "type": "git", "url": "https://github.com/masroore/laravel-validation" }
  ],
  "require": {
      ...
      "prettus/laravel-validation": "dev-master"
  },