Don't recommend `pydot-ng` (#336)

The `pydot_ng` recommendation should definitely be dropped since that project is officially archived in favor of pydot: https://github.com/pydot/pydot-ng

Don't recommend `pydot-ng` (#336)
6bef816b · l8l · GitHub · ec6a3153 · 6bef816b
--- a/doc/library/d3viz/index.rst
+++ b/doc/library/d3viz/index.rst
@@ -17,10 +17,9 @@ Requirements
 ------------

 ``d3viz`` requires the `pydot <https://pypi.python.org/pypi/pydot>`__
-package. `pydot-ng <https://github.com/pydot/pydot-ng>`__ fork is better
-maintained, and it works both in Python 2.x and 3.x. Install it with pip::
+package. Install it with pip::

-    pip install pydot-ng
+    pip install pydot

 Like PyTensor’s printing module, ``d3viz``
 requires `graphviz <http://www.graphviz.org/>`__ binary to be available.