root/pypi: links for gravipy

root/pypi GraviPy-0.2.0.tar.gz
root/pypi GraviPy-0.2.0-py3.7.egg
root/pypi GraviPy-0.2.0-py3-none-any.whl
root/pypi GraviPy-0.1.0.tar.gz