loongson/pypi: links for prettyetc

loongson/mirror prettyetc-0.4.0-py3-none-any.whl
loongson/mirror prettyetc-0.3.2-py3-none-any.whl
loongson/mirror prettyetc-0.2.1-py3-none-any.whl
loongson/mirror prettyetc-0.1.5-py3-none-any.whl