This avoids the deprecation warning when you call Yaml::parse with a path since version 2.2:
PHP Deprecated: The ability to pass file names to the Symfony\Component\Yaml\Yaml::parse method is deprecated since version 2.2 and will be removed in 3.0. Pass the YAML contents of the file instead. in /vendor/symfony/yaml/Symfony/Component/Yaml/Yaml.php on line 58
This avoids the deprecation warning when you call Yaml::parse with a path since version 2.2: