nano-minibuffer implicitly depends on nano-color

[rprechelt]

The optional nano-minibuffer.el uses material-color on L54 but does not explicitly load nano-colors.el which is another optional module and therefore causes a backtrace error if your init file doesn't already require nano-colors.

For ease of use by new emacs users, I think it would be better if:

1. A sentence is added to the description of nano-minibuffer.el in the README that nano-colors.el is also required and must be loaded first, or
2. nano-colors.el is explicitly loaded by nano-minibuffer.el, or
3. We replace the call to material-color with one from nano-basecolors.el.

I'll happily make an MR if you have an opinion about which of these options you'd like to see merged.

[rougier]

Good catch, thank you. I think option 3 might be the best and the most compatible with dark/light themes. If you can make a PR that would be great.