更新 '_posts/hello-world.md'

_posts/hello-world.md

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 title: Hello World
+cover: https://static.jqwei.com/blog/img/text/5.png
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 Welcome to [Hexo](https://hexo.io/)! This is your very first post. Check [documentation](https://hexo.io/docs/) for more info. If you get any problems when using Hexo, you can find the answer in [troubleshooting](https://hexo.io/docs/troubleshooting.html) or you can ask me on [GitHub](https://github.com/hexojs/hexo/issues).