本地 host 文件中添加一下字段
C:WindowsSystem32driversetc
140.82.113.3 github.com
140.82.114.4 gist.github.com
185.199.108.153 assets-cdn.github.com
185.199.110.133 raw.githubusercontent.com
185.199.110.133 gist.githubusercontent.com
185.199.110.133 cloud.githubusercontent.com
185.199.110.133 camo.githubusercontent.com
185.199.110.133 user-images.githubusercontent.com
之后根据系统执行刷新host缓存命令，一定要多执行几次！！！！！！！
# windows: ipconfig /flushdns
# linux:sudo killall -HUP mDNSResponder