root/pypi: links for mask-plasmid

root/pypi mask_plasmid-0.1.8.macosx-10.13-x86_64.tar.gz
root/pypi mask_plasmid-0.1.8-py2.py3-none-any.whl
root/pypi mask_plasmid-0.1.7.macosx-10.13-x86_64.tar.gz
root/pypi mask_plasmid-0.1.7-py2.py3-none-any.whl