loongson/pypi: links for showcallstack

loongson/mirror ShowCallStack-0.3.0.tar.gz
loongson/mirror ShowCallStack-0.2.2.tar.gz
loongson/mirror ShowCallStack-0.2.1.tar.gz
loongson/mirror ShowCallStack-0.2.0.tar.gz
loongson/mirror ShowCallStack-0.1.0.tar.gz