Add Asset Group(s) to Role

PUT https://{{API_URL}}/roles/:id/add_asset_groups

Update a single role's attributes by ID.

Key	Datatype	Required	Description
`**asset_groups - updated in body tab`	string		array of strings - An array of asset group names to add to a role's existing set of asset groups.

{"role"=>{"asset_groups"=>["new group"]}}