Added download_url to be able to upload to pypi.
diff --git a/python/setup.py b/python/setup.py
index 0f4b53c..76f0cbc 100755
--- a/python/setup.py
+++ b/python/setup.py
@@ -219,6 +219,7 @@
       name='protobuf',
       version=GetVersion(),
       description='Protocol Buffers',
+      download_url='https://github.com/google/protobuf/releases',
       long_description="Protocol Buffers are Google's data interchange format",
       url='https://developers.google.com/protocol-buffers/',
       maintainer='protobuf@googlegroups.com',