Executei o comando pelo Ubuntu e está aparecendo a seguinte mensagem que está dando problema e não está deixando eu continuar o curso: Could not fetch https://api.github.com/repos/zendframework/zend-feed/zipball/c5528e2fd632a5dc09b5487fabca125e4b88d9c0, please create a GitHub OAuth token to go over the API rate limit Head to https://github.com/settings/tokens/new?scopes=repo&description=Composer+on+root+2016-02-11+1648 to retrieve a token. It will be stored in "/home/fernando/.composer/auth.json" for future use by Composer. Token (hidden):