loongson/pypi: links for gym-demonstration

loongson/mirror gym_demonstration-0.0.7.tar.gz
loongson/mirror gym_demonstration-0.0.6.tar.gz
loongson/mirror gym_demonstration-0.0.5.tar.gz
loongson/mirror gym_demonstration-0.0.4.tar.gz
loongson/mirror gym_demonstration-0.0.3.tar.gz
loongson/mirror gym_demonstration-0.0.2.tar.gz
loongson/mirror gym_demonstration-0.0.1.tar.gz