Is your feature request related to a problem? Please describe.
Primarily when managing my dotfiles (using stow), I have several hidden directories that I can't easily search through.

Describe the solution you'd like
A parameter to feed into grep_string when calling it, e.g. hidden = true.

Describe alternatives you've considered
I've read the documentation and parameters that are fed into grep_string but I haven't found a proper alternative. Though, I might've missed something.

Additional context
I have a suggested solution PR that I am making this issue for.