loongson/pypi: links for cmsplugin-css-background

loongson/mirror cmsplugin-css-background-0.2.0.tar.gz
loongson/mirror cmsplugin_css_background-0.2.0-py2.py3-none-any.whl
loongson/mirror cmsplugin-css-background-0.1.0.tar.gz
loongson/mirror cmsplugin_css_background-0.1.0-py2.py3-none-any.whl