private function writeContributors(array $contributors)
    {
        $nameColumnSize = max(array_map('strlen', array_values($contributors)));
        $columns        = sprintf('%s  GitHub Username', str_pad('Name', $nameColumnSize));

        $this->output->writeLine($columns);
        $this->output->writeLine(str_repeat('-', strlen($columns)));

        foreach ($contributors as $gitHubUser => $name) {
            $this->output->writeLine(sprintf("%s  %s", str_pad($name, $nameColumnSize), $gitHubUser));
        }
    }