Docker installation (without Python3 support) - Instructions wrong

Hi there, the instructions say:

```
For Docker installation (without Python3 support) or /etc/pihole on different directory
You can pass two optional arguments to whitelist.py, uninstall.py, and referral.sh:

-d or --dir to specify the Pi-hole etc directory (in normal install should be /etc/pihole)
-D or --docker to specify if Pi-hole is running as Docker container
git clone https://github.com/anudeepND/whitelist.git
sudo python3 whitelist/scripts/whitelist.py --dir /home/docker/pihole/etc-pihole/ --docker
```

So i should run a python3 command in case i don't have python3? There is only one .sh file for the referral-sites. How do i install the whitelist?