Update changelog

CHANGELOG.md

@@ -1,5 +1,17 @@
 # Release Notes
 
+## [v5.8.3 (2019-03-05)](https://github.com/laravel/laravel/compare/v5.8.0...v5.8.3)
+
+### Added
+- Add AWS S3 Bucket to `.env.example` ([f84a69e](https://github.com/laravel/laravel/commit/f84a69ee852bd44363042a61995d330574b6b8c3))
+
+### Changed
+- Set default AWS region ([ff4f40f](https://github.com/laravel/laravel/commit/ff4f40fbabcefcb87facb1346fcfe5b8266eb40d), [#4956](https://github.com/laravel/laravel/pull/4956))
+
+### Fixed
+- Comment out non-existing model class and policy example ([f4ff4f4](https://github.com/laravel/laravel/commit/f4ff4f4176f7d931e301f36b95a46285ac61b8b8))
+- Only apply MySQL PDO options when extension exists ([3001f3c](https://github.com/laravel/laravel/commit/3001f3c6e232ba7ce2ecdbdfe6e43b4c64ee05ad))
+
 ## [v5.8.0 (2019-02-26)](https://github.com/laravel/laravel/compare/v5.7.28...v5.8.0)
 
 ### Added