Convert both ways.

This is not a criticism of your work, its great, but just something I don't understand. I'm so confused as to why when someone develops a `JSON` and `XML` converter that they don't create the other conversion. So all the community has a `JSON` to `XML` parser and a `XML` to `JOSN` parser that don't work together. Do you know of any interchangeable parsers? Your library on `npm` is just `xml` and it should really be the one that does both.