Mention the planned removal of unbound methods.

pep-3000.txt

@@ -78,6 +78,7 @@ To be removed:
 * String exceptions [2]_
 * ```x```: use ``repr(x)`` [2]_
 * The ``<>`` operator (use ``!=`` instead) [3]_
+* Unbound methods [7]_
 
 
 Built-ins
@@ -138,6 +139,9 @@ References
 .. [6] python-dev email ("Comparing heterogeneous types")
    http://mail.python.org/pipermail/python-dev/2004-June/045111.html
 
+.. [7] python-dev email ("Let's get rid of unbound methods")
+   http://mail.python.org/pipermail/python-dev/2005-January/050625.html
+
 
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