root/pypi: links for casm-tools

root/pypi casm_tools-2.0a2.tar.gz
root/pypi casm_tools-2.0a2-py3-none-any.whl
root/pypi casm_tools-2.0a1.tar.gz
root/pypi casm_tools-2.0a1-py3-none-any.whl