DigitalOcean Debian stretch source list

有的时候重置成debian,源莫名其妙会是ubuntu的,改成debian官方源速度又太慢,找了好久才找到digitalocean自己的源

 deb http://mirrors.digitalocean.com/debian stretch main
deb-src http://mirrors.digitalocean.com/debian stretch main
deb http://security.debian.org/ stretch/updates main
deb-src http://security.debian.org/ stretch/updates main