EDIT: See #444 (comment) for explaination
There is a problem with displaying the plain version of the new bash icon. It shows up but not displaying the svg code below:
It works fine for the original version and also for the font versions. I wonder if this might be a result of the updated build process (removing color function or so? It's just a guess).

Interesting fact: When you open the svg in the browser it will show repeated:
https://raw.githubusercontent.com/devicons/devicon/master/icons/bash/bash-plain.svg
