protected function createSlackDriver(array $config)
    {
        return new Monolog(
            $this->parseChannel($config), [
            $this->prepareHandler(
                new SlackWebhookHandler(
                    $config['url'],
                    $config['channel'] ?? null,
                    $config['username'] ?? 'zilf',
                    $config['attachment'] ?? true,
                    $config['emoji'] ?? ':boom:',
                    $config['short'] ?? false,
                    $config['context'] ?? true,
                    $this->level($config)
                )
            ),
            ]
        );
    }