More meta data attributes

[elinalutz]

As per the tutorial (https://rubenarslan.github.io/codebook/articles/codebook_tutorial.html#metadata-about-the-entire-dataset-1) I have added the meta data field "funder", but when knitting the codebook this field is labelled as "x" in the machine readable json meta data section of the codebook. Is this intentional or a bug?

This is the line I would insert into the example codebook code:

metadata(bfi)$funder <- "abc"

Thanks a lot!