How to upgrade yarn.social running as a vultr app:

- download the latest binary from https://git.mills.io/yarnsocial/yarn/releases
- `systemctl stop yarnd.service `
- `cd /usr/bin/local`
- `cp yarnd yarnd_old`
- upload yarnd to /usr/bin/local
- `chmod +x yarnd`
- `reboot`

Enjoy!