loongson/mirror: links for ecadataset

loongson/mirror ecadataset-0.3.4.tar.gz
loongson/mirror ecadataset-0.3.4-py3-none-any.whl
loongson/mirror ecadataset-0.2.2.tar.gz
loongson/mirror ecadataset-0.2.2-py3-none-any.whl