protected function configure()
{
$this->setName('self-update')->setAliases(array('selfupdate'))->addOption('unstable', null, InputOption::VALUE_NONE, 'Load unstable version from develop branch')->setDescription('Updates n98-magerun.phar to the latest version.')->setHelp(<<<EOT
The <info>self-update</info> command checks github for newer
versions of n98-magerun and if found, installs the latest.
<info>php n98-magerun.phar self-update</info>
EOT
);
}