loongson/pypi: links for plotchecker

loongson/mirror plotchecker-0.2.0.tar.gz
loongson/mirror plotchecker-0.2.0-py2.py3-none-any.whl
loongson/mirror plotchecker-0.1.0-py2.py3-none-any.whl
loongson/mirror plotchecker-0.1.0.dev-py2.py3-none-any.whl