loongson/pypi: links for backtesting-pp2

loongson/mirror backtesting_pp2-0.0.3-py3-none-any.whl
loongson/mirror backtesting_pp2-0.0.2-py3-none-any.whl
loongson/mirror backtesting_pp2-0.0.1-py3-none-any.whl