loongson/pypi: links for ab-lab

loongson/mirror ab_lab-0.20.4.tar.gz
loongson/mirror ab_lab-0.20.4-py3-none-any.whl
loongson/mirror ab_lab-0.20.3.tar.gz
loongson/mirror ab_lab-0.20.3-py3-none-any.whl
loongson/mirror ab_lab-0.20.2.tar.gz
loongson/mirror ab_lab-0.20.2-py3-none-any.whl