Support for nested JSON objects

[WillFleming]

The Alteryx promote-python library supports nested JSON objects:

{
  "name": {
    "first_name": "colin",
    "last_name": "kaepernick"
  }
}

This doesn't work in the R client though. The jsonlite package supports nested JSON, but for some reason it is being flattened for the promote request:

{
      "name.first_name": "colin",
      "name.last_name": "kaepernick"
}

Is there any reason for flattening the JSON here (and not in python) ?