_repr_svg error with graphviz 0.19

[Andy-Tr]

The latest updates to graphviz(0.19) removed the _repr_svg() function. Trying to show the graph for a model will fail with an AttributeError: AttributeError Traceback (most recent call last)

/opt/conda/lib/python3.8/site-packages/IPython/core/formatters.py in call(self, obj)

343             method = get_real_method(obj, self.print_method)

344             if method is not None:

--> 345 return method()

346             return None

347         else:

/opt/conda/lib/python3.8/site-packages/esppy/project.py in repr_svg(self)

778     def _repr_svg_(self):

779         try:

--> 780 return scale_svg(self.to_graph().repr_svg())

781         except ImportError:

782             raise AttributeError('_repr_svg_')

AttributeError: 'Digraph' object has no attribute 'repr_svg'

The workaround is to downgrade graphviz to 0.18.2