loongson/pypi: links for wsgi-echo-server

loongson/mirror wsgi_echo_server-0.0.6.tar.gz
loongson/mirror wsgi_echo_server-0.0.6-py3-none-any.whl
loongson/mirror wsgi_echo_server-0.0.5.tar.gz
loongson/mirror wsgi_echo_server-0.0.5-py3-none-any.whl
loongson/mirror wsgi_echo_server-0.0.4.tar.gz
loongson/mirror wsgi_echo_server-0.0.4-py3-none-any.whl