protected function triggerDeploy($project)
    {
        // Ensure we have a project hook.
        if (!$project) {
            throw new InvalidArgumentException('Incorrect project hook.');
        }

        // Trigger the deploy hook.
        file_get_contents(sprintf(self::DEPLOY_URL, $project));

        // Output message.
        $this->info('Deployment request successful!');
    }