loongson/pypi: links for worldengine

loongson/mirror worldengine-0.20.0.tar.gz
loongson/mirror worldengine-0.20.0-py2.py3-none-any.whl
loongson/mirror worldengine-0.19.0.tar.gz
loongson/mirror worldengine-0.19.0-py2.py3-none-any.whl
loongson/mirror worldengine-0.18.0.tar.gz
loongson/mirror worldengine-0.18.0-py2.py3-none-any.whl