loongson/pypi: links for vector-demo

loongson/mirror vector_demo-0.3.1.tar.gz
loongson/mirror vector_demo-0.3.1-py3-none-any.whl
loongson/mirror vector_demo-0.2.1.tar.gz
loongson/mirror vector_demo-0.2.1-py2.py3-none-any.whl
loongson/mirror vector_demo-0.1.1.tar.gz
loongson/mirror vector_demo-0.1.1-py2.py3-none-any.whl