"symfony/yaml" should be a required dependency?

[attozk]

Without manually including symfony/yaml it craps on parsing Yaml file:

        $configBuilder = new YamlFileConfigurationBuilder(array($this->configFilePath));
        $this->config = $configBuilder->build();


Call Stack:
...
    0.0300     512032   4. Dflydev\DotAccessConfiguration\AbstractConfigurationBuilder->build()
    0.0325     555464   5. Dflydev\DotAccessConfiguration\YamlFileConfigurationBuilder->internalBuild() vendor\dflydev\dot-access-configuration\src\Dflydev\DotAccessConfiguration\AbstractConfigurationBuilder.php:59