loongson/pypi: links for pyalgotrade

loongson/mirror PyAlgoTrade-0.20.tar.gz
loongson/mirror PyAlgoTrade-0.18.tar.gz
loongson/mirror PyAlgoTrade-0.17.tar.gz
loongson/mirror PyAlgoTrade-0.16.tar.gz
loongson/mirror PyAlgoTrade-0.15.tar.gz
loongson/mirror PyAlgoTrade-0.14.tar.gz
loongson/mirror PyAlgoTrade-0.13.tar.gz