protected function configure()
{
parent::configure();
$this->setDescription("Updates plugin packages from the .altax/composer.json under the current directory.")->addOption('--working-dir', '-d', InputOption::VALUE_REQUIRED, 'If specified, use the given directory as working directory.')->addOption('--global', '-g', InputOption::VALUE_NONE, "If specified, use user home configuration '~/.altax/composer.json'");
}