[8.x] update changelog

Author: TBlindaruk

CHANGELOG-8.x.md

@@ -0,0 +1,8 @@
+# Release Notes for 8.x
+
+## [Unreleased](https://github.com/laravel/framework/compare/v8.0.0...7.x)
+
+
+## [v8.0.0 (2020-09-08)](https://github.com/laravel/framework/compare/v7.27.0...v8.0.0)
+
+Check the upgrade guide in the [Official Laravel Upgrade Documentation](https://laravel.com/docs/8.x/upgrade). Also you can see some release notes in the [Official Laravel Release Documentation](https://laravel.com/docs/8.x/releases).