Chung-Shan

Results 2 issues of Chung-Shan

Hi, I update hyperparameters of PPO and GAIL to have a more stable results according to [PPO implementation #9](https://github.com/higgsfield/RL-Adventure-2/issues/9#issuecomment-490742555) PPO: ![image](https://user-images.githubusercontent.com/26859800/123906565-fef1f380-d9a6-11eb-989d-affc13d39249.png) GAIL: ![image](https://user-images.githubusercontent.com/26859800/123906593-0dd8a600-d9a7-11eb-874b-2c702d530e5a.png)