I'm afraid this (slightly) backward-incompatible change may come as something of a surprise. The release notes should probably indicate the user actions that this change may require:

- upload_docs (setuptools) will no longer work unless the old repository (https://pypi.python.org) is indicated in setup.cfg or .pypirc or on the command line.
- Any passwords saved based on the repository will need to be updated (such as in the keyring).