loongson/pypi: links for scihub2pdf

loongson/mirror scihub2pdf-0.4.2.tar.gz
loongson/mirror scihub2pdf-0.4.1.tar.gz
loongson/mirror scihub2pdf-0.4.0.tar.gz
loongson/mirror scihub2pdf-0.3.1.tar.gz
loongson/mirror scihub2pdf-0.1.0.tar.gz