Suggest TraversableResources as the alternative for ResourceLoader.
Previously, ResourceReader was the suggested alternative, but it
is itself deprecated in favour of TraversableResources.
.. class:: ResourceLoader
+ *Superseded by TraversableResources*
+
An abstract base class for a :term:`loader` which implements the optional
:pep:`302` protocol for loading arbitrary resources from the storage
back-end.
.. deprecated:: 3.7
This ABC is deprecated in favour of supporting resource loading
- through :class:`importlib.resources.abc.ResourceReader`.
+ through :class:`importlib.resources.abc.TraversableResources`.
.. abstractmethod:: get_data(path)