root/pypi: links for chebfun

root/pypi chebfun-0.7.1.tar.gz
root/pypi chebfun-0.7.1-py3-none-any.whl
root/pypi chebfun-0.6.0.tar.gz
root/pypi chebfun-0.6.0-py3-none-any.whl
root/pypi chebfun-0.5.0.tar.gz
root/pypi chebfun-0.5.0-py3-none-any.whl
root/pypi chebfun-0.4.4.1.tar.gz
root/pypi chebfun-0.4.4.1-py3-none-any.whl