loongson/pypi: links for pysub20

loongson/mirror pysub20-0.0.2.tar.gz
loongson/mirror pysub20-0.0.2-py3-none-any.whl
loongson/mirror pysub20-0.0.1.tar.gz
loongson/mirror pysub20-0.0.1-py3-none-any.whl
loongson/mirror pysub20-0.0.1.dev21.tar.gz
loongson/mirror pysub20-0.0.1.dev21-py3-none-any.whl