loongson/pypi: links for elearning-grading

loongson/mirror elearning-grading-0.2.2.tar.gz
loongson/mirror elearning-grading-0.2.1.tar.gz
loongson/mirror elearning-grading-0.2.0.tar.gz
loongson/mirror elearning-grading-0.1.0.tar.gz