Blacklist Python 3.3 in setup.py as we can now use a newer PyPy.

setup.py

@@ -144,7 +144,5 @@ setup(
       repozo = ZODB.scripts.repozo:main
     """,
     include_package_data=True,
-    # The pypy3 we test with on travis CI is still a Python 3.3
-    # implementation, so we don't explicitly blacklist 3.3 yet.
-    python_requires='>=2.7,!=3.0.*,!=3.1.*,!=3.2.*',
+    python_requires='>=2.7,!=3.0.*,!=3.1.*,!=3.2.*,!=3.3.*',
 )