Added changes in Travis CI to changelog

Author: grogy

CHANGELOG.md

@@ -22,6 +22,8 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/).
 - To be compatible with future PHPUnit version, using the ^4.8.36 version at least from [@peter279k](https://github.com/peter279k).
 - Changed namespace to PHPunit\Framework\TestCase class namesapce from [@peter279k](https://github.com/peter279k).
 - Composer: allow installation of more recent Parallel Lint [#9](https://github.com/php-parallel-lint/PHP-Var-Dump-Check/pull/9) from [@jrfnl](https://github.com/jrfnl).
+- Travis: removed sudo [#8](https://github.com/php-parallel-lint/PHP-Var-Dump-Check/pull/8) from [@jrfnl](https://github.com/jrfnl).
+- Travis: removed Composer option `--prefer-source` [#8](https://github.com/php-parallel-lint/PHP-Var-Dump-Check/pull/8) from [@jrfnl](https://github.com/jrfnl).
 
 ## [v0.4] - 2020-04-25