loongson/pypi: links for vtk-slice3d

loongson/mirror vtk_slice3d-0.3.0.tar.gz
loongson/mirror vtk_slice3d-0.3.0-py3-none-any.whl
loongson/mirror vtk_slice3d-0.2.0.tar.gz
loongson/mirror vtk_slice3d-0.2.0-py3-none-any.whl
loongson/mirror vtk_slice3d-0.1.0.tar.gz
loongson/mirror vtk_slice3d-0.1.0-py3-none-any.whl