loongson/pypi: links for pywebhooks

loongson/mirror pywebhooks-0.5.5.tar.gz
loongson/mirror pywebhooks-0.5.4.tar.gz
loongson/mirror pywebhooks-0.5.3.tar.gz
loongson/mirror pywebhooks-0.5.2.tar.gz
loongson/mirror pywebhooks-0.5.1.tar.gz