New Features
- `make_graph` - Create UML graphs that show inheritance structure of `HasProperties` class hierarchies. See the [readme](https://github.com/seequent/properties-inheritance-graph/blob/v1.0.0/README.rst) and [function documentation](https://github.com/seequent/properties-inheritance-graph/blob/v1.0.0/properties_inheritance_graph/graph.pyL52-L117).