Failed to connect to raw.githubusercontent.com port 443: Connection refused

用wget或者curl获取github文件的时候报出connection refused错误，可以通过以下方式解决：

在本机的host文件添加以下几行：

199.232.68.133 raw.githubusercontent.com

199.232.68.133 user-images.githubusercontent.com

199.232.68.133 avatars2.githubusercontent.com

199.232.68.133 avatars1.githubusercontent.com

https://github.com/hawtim/hawtim.github.io/issues/10

https://unix.stackexchange.com/questions/228412/how-to-wget-a-github-file