loongson/mirror: links for bgr2grey

loongson/mirror bgr2grey-1.0.1.tar.gz
loongson/mirror bgr2grey-1.0.1-py3-none-any.whl
loongson/mirror bgr2grey-1.0.0.tar.gz
loongson/mirror bgr2grey-1.0.0-py3-none-any.whl