Add output when no files match

[Noirbot]

It would be helpful to have some sort of output if I run lint-staged, but it finds no files that have matching linters. Right now, I just see something like

> lint-staged

Which doesn't really tell me anything about what happened, and leaves me wondering if it did anything at all.

Perhaps something like:

> lint-staged

✔ No files staged matching *.{js,jsx}

For each linter pattern.

[okonet]

It's actually by design since I didn't want to generate noise in the CLI but I can see how this can be helpful though. I wouldn't mind a PR for this I guess.

[Noirbot]

We could even do something more minimal than what I proposed - It would just be helpful to have some indication that lint-staged actually ran. I'll see about making a PR.

[okonet]

Yeah, propose a better solution and I'll consider it :)