loongson/pypi: links for chemfit

loongson/mirror chemfit-2.3.1-py3-none-any.whl
loongson/mirror chemfit-2.3.0-py3-none-any.whl
loongson/mirror chemfit-2.2.0-py3-none-any.whl
loongson/mirror chemfit-2.1.1-py3-none-any.whl
loongson/mirror chemfit-2.1.0-py3-none-any.whl