Fix deprecated link to Python Testing Tools Taxonomy.  Reported by Daniel Greenfeld on docs@.
diff --git a/Doc/library/unittest.rst b/Doc/library/unittest.rst
index e5faa9a..999b024 100644
--- a/Doc/library/unittest.rst
+++ b/Doc/library/unittest.rst
@@ -91,7 +91,7 @@
       Third-party unittest frameworks with a lighter-weight syntax for writing
       tests.  For example, ``assert func(10) == 42``.
 
-   `The Python Testing Tools Taxonomy <http://pycheesecake.org/wiki/PythonTestingToolsTaxonomy>`_
+   `The Python Testing Tools Taxonomy <http://wiki.python.org/moin/PythonTestingToolsTaxonomy>`_
       An extensive list of Python testing tools including functional testing
       frameworks and mock object libraries.