loongson/pypi: links for immutable-collection

loongson/mirror immutable_collection-1.1.post2.tar.gz
loongson/mirror immutable_collection-1.1.post2-py2.py3-none-any.whl
loongson/mirror immutable_collection-1.1.post2-py2.7.egg
loongson/mirror immutable_collection-1.1.post1.tar.gz
loongson/mirror immutable_collection-1.1.post1-py2.py3-none-any.whl
loongson/mirror immutable_collection-1.1.post1-py2.7.egg