loongson/pypi: links for s2reader3

loongson/mirror s2reader3-0.6.4.tar.gz
loongson/mirror s2reader3-0.6.3.tar.gz
loongson/mirror s2reader3-0.6.2.tar.gz
loongson/mirror s2reader3-0.6.1.tar.gz
loongson/mirror s2reader3-0.6.tar.gz