loongson/mirror: links for gym3

loongson/mirror gym3-0.3.3-py3-none-any.whl
loongson/mirror gym3-0.3.2-py3-none-any.whl
loongson/mirror gym3-0.3.1-py3-none-any.whl
loongson/mirror gym3-0.3.0-py3-none-any.whl