Revert "DOC Update note on code contribution: use issue tracker not mailing list (scikit-learn#12917)"

Xing · web-flow · commit 13e78647800a · 2019-04-28T15:16:17.000-04:00
This reverts commit cc28021.
diff --git a/doc/developers/contributing.rst b/doc/developers/contributing.rst
@@ -169,13 +169,10 @@ Contributing code
 
 .. note::
 
-  To avoid duplicating work, it is highly advised that you search through the
-  `issue tracker <https://github.com/scikit-learn/scikit-learn/issues>`_ and
-  the `PR list <https://github.com/scikit-learn/scikit-learn/pulls>`_.
-  If in doubt about duplicated work, or if you want to work on a non-trivial
-  feature, it's recommended to first open an issue in
-  the `issue tracker <https://github.com/scikit-learn/scikit-learn/issues>`_
-  to get some feedbacks from core developers.
+  To avoid duplicating work, it is highly advised that you contact the
+  developers on the mailing list before starting work on a non-trivial feature.
+
+  https://mail.python.org/mailman/listinfo/scikit-learn
 
 How to contribute
 -----------------
