filenames with square brackets

[felipesanches]

At google/fonts#1817 (comment) @eliheuer said:

FontBakery currently doesn't work with filenames with square brackets in them. I had to rename the files to generate reports for google/fonts#1806, so now it's not perfectly clear that the FontBakery report represents the font from the PR.

@eliheuer, could you please provide further info about the issue here so that I can investigate and better diagnose the problem?

[eliheuer]

I'm using Zsh with iTerm2 on MacOS, when I try to run FontBakery on a file following the current spec, I get this: