loongson/pypi: links for vtrplot

loongson/mirror vtrplot-0.3.4.tar.gz
loongson/mirror vtrplot-0.3.4-py2-none-any.whl
loongson/mirror vtrplot-0.3.1.tar.gz
loongson/mirror vtrplot-0.3.1-py2-none-any.whl
loongson/mirror vtrplot-0.3.0.tar.gz
loongson/mirror vtrplot-0.3.0-py2-none-any.whl