loongson/pypi: links for serf-plugin-handler

loongson/mirror serf-plugin-handler-0.2.0.tar.gz
loongson/mirror serf-plugin-handler-0.1.6.dev11.tar.gz
loongson/mirror serf-plugin-handler-0.1.5.tar.gz
loongson/mirror serf-plugin-handler-0.1.4.tar.gz
loongson/mirror serf-plugin-handler-0.1.3.dev6.tar.gz