Sorry, image link is broken

[slarrain]

I recently installed this app version 1.6.0 on my Ubuntu 21.04.4 LTS machine, and I was getting Sorry, image link is broken on every Image, with -iot.

So it turns out I needed to install this

sudo apt install libsixel-bin

as per this comment.

After installing ubuntu's libsixel-bin (python-libsixel was installed with pip along with rainbowstream), I now have images and is working properly. Perhaps is something that should be added to the Readme or Install instructions.