Docker image not found

Hi,

thank you for this awesome docker container! I tried to run it on my Raspberry Pi 3 this morning and I saw the following error:

```bash
pi@raspberrypi:~ $ curl -L https://bit.ly/2CzLV3T -o setup.sh
% Total % Received % Xferd Average Speed Time Time Time Current
Dload Upload Total Spent Left Speed
100 168 100 168 0 0 308 0 --:--:-- --:--:-- --:--:-- 308
100 5982 100 5982 0 0 7250 0 --:--:-- --:--:-- --:--:-- 7250
pi@raspberrypi:~ $ sudo bash setup.sh
Error response from daemon: manifest for innovativeinventor/docker-pivpn:armhf not found
Unable to find image 'innovativeinventor/docker-pivpn:armhf' locally
docker: Error response from daemon: manifest for innovativeinventor/docker-pivpn:armhf not found.
See 'docker run --help'.

Cloning into 'docker-pivpn'...
remote: Counting objects: 11, done.
remote: Compressing objects: 100% (9/9), done.
remote: Total 11 (delta 2), reused 4 (delta 0), pack-reused 0
Unpacking objects: 100% (11/11), done.
must specify at least one container source
setup.sh: line 201: warning: command substitution: ignored null byte in input
Error: No such container: bash
Error: No such container: bash
Error: No such container: dpkg
Error: No such container: bash
Restarting container . . .
"docker restart" requires at least 1 argument.
See 'docker restart --help'.

Usage: docker restart [OPTIONS] CONTAINER [CONTAINER...] [flags]

Restart one or more containers
Error: No such container:
Your port is
Error: No such container: sed
Generating configs . . . Please answer the prompts
Error: No such container: pivpn
must specify at least one container source
Done! To execute commands, type docker exec -it /bin/bash
All currently generated configs are in the ovpns directory
To generate more configs, just type docker exec -it pivpn -a
Your openvpn port should be , open it up if you are using a firewall
```

Am I doing something wrong?

Thank you very much for your help.
Chris