Adds links to the Slack team.

README.rst

@@ -24,3 +24,9 @@ Documentation
 -------------
 
 Available `on Read The Docs <http://django-cachalot.readthedocs.org>`_.
+
+
+Discussion
+----------
+
+Via `our Slack team <https://django-cachalot.slack.com>`_.

docs/reporting.rst

@@ -6,8 +6,7 @@ Bug reports, questions, discussion, new features
 - If you spotted **a bug**, please file a precise bug report
   `on GitHub <https://github.com/BertrandBordage/django-cachalot/issues>`_
 - If you have **a question** on how django-cachalot works or to **simply
-  discuss**, `go to our Google group
-  <https://groups.google.com/forum/#!forum/django-cachalot>`_.
+  discuss**, `chat with us on Slack <https://django-cachalot.slack.com>`_.
 - If you want **to add a feature**:
 
   - if you have an idea on how to implement it, you can fork the project