Update overrides.json
Update overrides.json

These 3 libraries seem to support Python 3:

1. https://pypi.python.org/pypi/diamond - The download file is called diamond-4.0.451-py2.py3-none-any.whl
2. https://pypi.python.org/pypi/testresources - The download file is called testresources-2.0.0-py2.py3-none-any.whl, and the depencies are listed as "Python 2.6+ (or 3.3+)".
3. https://pypi.python.org/pypi/filechunkio - The pypi page says "Python 2.6+ is required" which would seem to include Python 3. And there's a checkin here that appears to have added support for Python 3: https://bitbucket.org/fabian/filechunkio/pull-requests/1/python-3-support/diff#comment-None
brettcannon/caniusepython3