Complains a lot about Newtonsoft.Json dependency

```c#
warning NU1603: Cardyff 1.0.0 depends on Newtonsoft.Json (>= 10.0.0 && < 11.0.0) but Newtonsoft.Json 10.0.0 was not found. An approximate best match of Newtonsoft.Json 10.0.1 was resolved.
```

somehow it decides it's not a perfect match --- it is