update url in setup

Author: Martin Durant

setup.py

@@ -11,7 +11,7 @@
 setup(name='streamz',
       version='0.5.2',
       description='Streams',
-      url='http://github.com/mrocklin/streamz/',
+      url='http://github.com/python-streamz/streamz/',
       maintainer='Matthew Rocklin',
       maintainer_email='mrocklin@gmail.com',
       license='BSD',