loongson/pypi: links for echemdb-ecdata

loongson/mirror echemdb_ecdata-0.5.1.tar.gz
loongson/mirror echemdb_ecdata-0.5.1-py3-none-any.whl
loongson/mirror echemdb_ecdata-0.5.0.tar.gz
loongson/mirror echemdb_ecdata-0.5.0-py3-none-any.whl
loongson/mirror echemdb_ecdata-0.4.1.tar.gz
loongson/mirror echemdb_ecdata-0.4.1-py3-none-any.whl
loongson/mirror echemdb_ecdata-0.4.0.tar.gz
loongson/mirror echemdb_ecdata-0.4.0-py3-none-any.whl