loongson/pypi: links for prob-distrs

loongson/mirror prob_distrs-0.5.1.tar.gz
loongson/mirror prob_distrs-0.5.tar.gz
loongson/mirror prob_distrs-0.4.tar.gz
loongson/mirror prob_distrs-0.3.tar.gz
loongson/mirror prob_distrs-0.2.1.tar.gz
loongson/mirror prob_distrs-0.2.tar.gz