[PATCH 2 of 2 stable] docs: note that the old issue tracker doesn’t work anymore

[Manuel Jacob]

# HG changeset patch
# User Manuel Jacob <me at manueljacob.de>
# Date 1600198226 -7200
#      Tue Sep 15 21:30:26 2020 +0200
# Branch stable
# Node ID d7b9dc92f3c0f85c87e8962bcc3fdca103670d03
# Parent  3124c863cd9eb9959896e8abeef2c08839844319
# EXP-Topic bitbucket_references
docs: note that the old issue tracker doesn’t work anymore

diff --git a/README.rst b/README.rst
--- a/README.rst
+++ b/README.rst
@@ -135,8 +135,9 @@
 
 - Follow Kallithea on Twitter, **@KallitheaSCM**.
 
-- Issues can be reported at `issue tracker
-  <https://bitbucket.org/conservancy/kallithea/issues>`_.
+- The `old issue tracker <https://bitbucket.org/conservancy/kallithea/issues>`_
+  is defunct after it was deleted by Bitbucket_. For now, please report issues
+  on the mailing list.
 
    .. note::