root/pypi: links for shift4

root/pypi shift4-2.1.0.tar.gz
root/pypi shift4-2.1.0-py3-none-any.whl
root/pypi shift4-2.0.0.tar.gz
root/pypi shift4-2.0.0-py3-none-any.whl
root/pypi shift4-1.0.0.tar.gz
root/pypi shift4-1.0.0-py3-none-any.whl