public function generateTwigExtensions($parameters)
    {
        $relPath = '/Twig/';
        if ($this->demosite) {
            $this->renderSingleFile($this->skeletonDir.$relPath, $this->bundle->getPath().$relPath, 'BikesTwigExtension.php', $parameters, true);
        }

        if ($this->isSymfony4()) {
            return;
        }

        $relPath = '/Resources/config/';
        $sourceDir = $this->skeletonDir.$relPath;
        $targetDir = $this->bundle->getPath().$relPath;
        $this->renderSingleFile($sourceDir, $targetDir, 'services.yml', $parameters, true);
    }