root/pypi: links for stegpng

root/pypi stegpng-1.0.0b5.tar.gz
root/pypi stegpng-1.0.0b4-py3-none-any.whl
root/pypi stegpng-1.0.0b3-py3-none-any.whl
root/pypi stegpng-1.0.0b2-py3-none-any.whl
root/pypi stegpng-1.0.0b1-py3-none-any.whl