loongson/pypi: links for mean-squared-error

loongson/mirror mean_squared_error-0.4.0.tar.gz
loongson/mirror Mean_Squared_Error-0.4.0-py3-none-any.whl
loongson/mirror Mean_Squared_Error-0.3-py3-none-any.whl
loongson/mirror Mean_Squared_Error-0.2-py3-none-any.whl
loongson/mirror Mean_Squared_Error-0.1-py3-none-any.whl