Don't show file header when outputting json

[Christoph Herzog]

When using pqrs cat --json the output still contains the file headers for each file, making it much less useful for quickly converting a file or a bunch of files to JSON.

I feel like the headers should not be present at all when outputting JSON or CSV. There could be an additional flag to add them.

[Manoj Karthick]

The header is already removed when using head with the --json flag, and cat command should work the same way too. Thanks for opening the issue!

[Manoj Karthick]

Hi @theduke, this has been fixed in the master branch. I am working a few other changes, so I'll publish a release in a couple of days.

[Christoph Herzog]

Thanks!