github相关问题处理
fatal: unable to access 'https://github.com/xxx/xxx': Failed to connect to github.com port 443 after 21047 ms: Couldn't connect to server
just execute this will be ok.
git config --global https.proxy http://127.0.0.1:7890
git config --global https.proxy http://127.0.0.1:7890
git config --global --unset http.proxy
git config --global --unset https.proxy