Update changelog

CHANGELOG.md

@@ -1,9 +1,10 @@
 # Release Notes
 
-## [Unreleased](https://github.com/laravel/laravel/compare/v5.8.3...master)
+## [Unreleased](https://github.com/laravel/laravel/compare/v5.8.3...develop)
 
 ### Changed
-- Upgrade the collision dependency from v2 to v3 ([#4963](https://github.com/laravel/laravel/pull/4963))
+- Require PHP 7.2 ([25cf4c4](https://github.com/laravel/laravel/commit/25cf4c492308b9c5148f9522d8dd8f8f18819f50))
+- Encourage to use PHPUnit 8 ([0582a20](https://github.com/laravel/laravel/commit/0582a20adddc0e6bd16ca05eeae93e6412924ad6))
 
 
 ## [v5.8.3 (2019-03-05)](https://github.com/laravel/laravel/compare/v5.8.0...v5.8.3)