loongson/pypi: links for r2dto-rdf

loongson/mirror r2dto_rdf-0.0.7.tar.gz
loongson/mirror r2dto_rdf-0.0.6.tar.gz
loongson/mirror r2dto_rdf-0.0.5.tar.gz
loongson/mirror r2dto_rdf-0.0.4.tar.gz
loongson/mirror r2dto_rdf-0.0.2.tar.gz