loongson/pypi: links for data-flow-graph

loongson/mirror data_flow_graph-0.4.1.tar.gz
loongson/mirror data_flow_graph-0.4.tar.gz
loongson/mirror data_flow_graph-0.3.tar.gz
loongson/mirror data_flow_graph-0.2.tar.gz
loongson/mirror data_flow_graph-0.1.tar.gz