FTS-1186: Adding the download url

setup.py

@@ -62,6 +62,7 @@ setup(
     author='FTS3 Developers',
     author_email='fts-devel@cern.ch',
     url='http://fts3-service.web.cern.ch/',
+    download_url='https://gitlab.cern.ch/fts/fts-rest',
     license='Apache 2',
     packages=['fts3', 'fts3.cli', 'fts3.model', 'fts3.rest', 'fts3.rest.client', 'fts3.rest.client.easy'],
     package_dir={'fts3': os.path.join(base_dir, 'src', 'fts3')},