private function createReleaseNotes(array $release)
    {
        $buildDir = $this->rootPath .'/build';
        $locationTemplate = $buildDir . '/release-%s.md';

        if (!is_dir($buildDir)) {
            mkdir($buildDir);
        }

        $umbrella = $release[self::DEFAULT_COMPONENT];
        $location = sprintf($locationTemplate, $umbrella['version']);

        unset($release[self::DEFAULT_COMPONENT]);

        ksort($release);

        $notes = [];
        foreach ($release as $key => $component) {
            $messages = [];
            foreach ($component['messages'] as $message) {
                $messages[] = sprintf('* %s', $message);
            }

            $notes[] = sprintf('### google/%s v%s', $key, $component['version'])
                . PHP_EOL . PHP_EOL . implode(PHP_EOL, $messages);
        }

        $template = file_get_contents(__DIR__ .'/templates/release-notes.md.txt');
        $template = str_replace('{version}', $umbrella['version'], $template);
        $template = str_replace('{notes}', implode(PHP_EOL . PHP_EOL, $notes), $template);

        file_put_contents($location, $template);

        return $location;
    }