Currently the nugets in https://github.com/GeoJSON-Net/GeoJSON.Net.Contrib for converting to/from GeoJSON objects only work with GeoJSON.NET. This effectively locks anyone who needs them into the old Newtonsoft.Json libraries. The most straight forward solution I can see for this is to fork `GeoJSON.Net.Contrib` to a new `GeoJSON.Text.Contrib` repo, and modify the `using` statements to GeoJSON.Text, and create new nugets to match.