root/pypi: links for substr8-core

root/pypi substr8_core-0.3.0.tar.gz
root/pypi substr8_core-0.3.0-py3-none-any.whl
root/pypi substr8_core-0.2.0.tar.gz
root/pypi substr8_core-0.2.0-py3-none-any.whl