Correct node version requirement in package file
Correct node version requirement in package file

`index.js` uses `require("json_file.json")` to load a JSON file,
but this is only supported in Node after version 5. The package
file is updated accordingly.

nevir/groc,druide/citare-scriptum,JoshuaToenyes/groc,andrewburgess/groc,gilt/groc,JoshuaToenyes/groc,erdii/groc,JoshuaToenyes/groc,erdii/groc,erdii/groc,nevir/groc,andrewburgess/groc,druide/citare-scriptum,gilt/groc,andrewburgess/groc,nevir/groc,erdii/groc,gilt/groc,andrewburgess/groc,druide/citare-scriptum,JoshuaToenyes/groc