Feature request: Add ability to configure multiple spec folders

[Tabby]

I'm working on at least one project where we have multiple folders with RSpec tests in, and it would be great if I could configure this extension to check them both instead of just one and have to keep changing it

In this case, I have tests in

• $PROJECT_ROOT/spec
• $PROJECT_ROOT/components/foo/spec

Would it be possible to add this feature?

Also, thanks very much for this extension it's been super useful!