git sync报错OpenSSL SSL_connect: Connection was reset in connection to github.com:443

报错信息：
OpenSSL SSL_connect: Connection was reset in connection to github.com:443
git did not exit cleanly exit code 1

解决办法：
刷新DNS缓存
ipconfig/flushdns

参考资料：
https://www.jianshu.com/p/62261a62c9cc