loongson/pypi: links for py-readability-metrics-small

loongson/mirror py_readability_metrics_small-1.8.tar.gz
loongson/mirror py_readability_metrics_small-1.7.tar.gz
loongson/mirror py_readability_metrics_small-1.6.tar.gz
loongson/mirror py_readability_metrics_small-1.5.tar.gz
loongson/mirror py-readability-metrics-small-1.4.4.tar.gz