报错问题：
Your configuration does not allow connections to http://packagist.org/packages.json. See https://getcomposer.org/doc/06-config.md#secure-http for details.
引用解决问题的文章地址：
http://blog.csdn.net/ougexingfuba/article/details/78658548；
https://www.cnblogs.com/lucky2017/p/8033937.html。
问题解决步骤：
