Update package metadata.

Author: whitequark

setup.py

@@ -16,7 +16,8 @@ def run(self):
     version="1.0",
     author="whitequark",
     author_email="whitequark@whitequark.org",
-    url="http://m-labs.hk/pythonparser",
+    url="https://m-labs.hk/pythonparser",
+    download_url="https://github.com/m-labs/pythonparser",
     description="A Python parser intended for use in tooling",
     long_description=open("README.md").read(),
     license="MIT",