loongson/pypi: links for flatdict2

loongson/mirror flatdict2-4.0.4.tar.gz
loongson/mirror flatdict2-4.0.4-py3-none-any.whl
loongson/mirror flatdict2-4.0.3.tar.gz
loongson/mirror flatdict2-4.0.3-py3-none-any.whl
loongson/mirror flatdict2-4.0.2.tar.gz
loongson/mirror flatdict2-4.0.2-py3-none-any.whl