root/pypi: links for silk2-tools-usage

root/pypi silk2.tools.usage-1.1.5.tar.gz
root/pypi silk2.tools.usage-1.1.5-py3-none-any.whl
root/pypi silk2.tools.usage-1.1.4.tar.gz
root/pypi silk2.tools.usage-1.1.4-py3-none-any.whl
root/pypi silk2.tools.usage-1.1.2.tar.gz
root/pypi silk2.tools.usage-1.1.2-py3-none-any.whl