message: Mention Joblib in installation doc
diff: @@ -260,6 +260,13 @@ a flag `enable_autodiff=True` is used). In order to reduce code duplication, we
  use `EagerPy <https://eagerpy.jonasrauber.de/>`_ which wraps arrays from
  PyTorch, TensorFlow and JAX in a common interface.
  +Joblib
  +------
  +
  +`Joblib <https://joblib.readthedocs.io/>`_ is used both as a dependency of `Scikit-learn`_,
  +and directly for parallelism in some modules (:class:`~gudhi.point_cloud.knn.KNearestNeighbors`,
  +:func:`~gudhi.representations.metrics.pairwise_persistence_diagram_distances`).
  +
  Hnswlib
  -------
  