[FEATURE] Don't log unchanged files

[koppor]

What would you like to change about the program?

The output should contain unchanged files only.

In a project of ~2.000 files, it is hard to see which was changed.

I would like to show the user which file changed. I cannot push into the repository of the user, because it is not possible to push to "foreign" forks.

This refs prettier/prettier#2611

Why do you think this is a cool idea?

Easy of use.