Merge pull request #298 from huangshiyu13/main

update readme

Gallery.md

@@ -69,7 +69,7 @@ Users are also welcome to contribute their own training examples and demos to th
 |                                                  [Omniverse Isaac Gym](https://github.com/NVIDIA-Omniverse/OmniIsaacGymEnvs)<br>  <img width="300px" height="auto" src="https://user-images.githubusercontent.com/34286328/171454189-6afafbff-bb61-4aac-b518-24646007cb9f.gif">                                                   |                                                              ![discrete](https://img.shields.io/badge/-discrete-brightgreen)                                                              |        [code](./examples/isaac/)        |
 |                                                                                                    [Snake](http://www.jidiai.cn/env_detail?envid=1)<br>  <img width="300px" height="auto" src="./docs/images/snakes_1v1.gif">                                                                                                     |                                 ![selfplay](https://img.shields.io/badge/-selfplay-blue)  ![discrete](https://img.shields.io/badge/-discrete-brightgreen)                                 |        [code](./examples/snake/)        |
 |                                                                                            [gym-pybullet-drones](https://github.com/utiasDSL/gym-pybullet-drones)<br>  <img width="300px" height="auto" src="./docs/images/drone.png">                                                                                            |                                                               ![continuous](https://img.shields.io/badge/-continous-green)                                                                | [code](./examples/gym_pybullet_drones/) |
-| [EnvPool](https://github.com/sail-sg/envpool)<br>  <img width="300px" height="auto" src="https://camo.githubusercontent.com/79afc4dc2741dd3a0b961979cbc5691349556bc367a6719c5e4b38924369bba2/68747470733a2f2f656e76706f6f6c2e72656164746865646f63732e696f2f656e2f6c61746573742f5f7374617469632f656e76706f6f6c2d6c6f676f2e706e67"> |                                                              ![discrete](https://img.shields.io/badge/-discrete-brightgreen)                                                              |       [code](./examples/envpool/)       |
+| [EnvPool](https://github.com/sail-sg/envpool)<br>  <img width="300px" height="auto" src="https://github.com/sail-sg/envpool/raw/main/docs/_static/images/favicon.png"> |                                                              ![discrete](https://img.shields.io/badge/-discrete-brightgreen)                                                              |       [code](./examples/envpool/)       |
 |                                                                                                            [GridWorld](./examples/gridworld/)<br>  <img width="300px" height="auto" src="./docs/images/gridworld.jpg">                                                                                                            |                                                              ![discrete](https://img.shields.io/badge/-discrete-brightgreen)                                                              |      [code](./examples/gridworld/)      |
 |                                                       [Super Mario Bros](https://github.com/Kautenja/gym-super-mario-bros)<br>  <img width="300px" height="auto" src="https://user-images.githubusercontent.com/2184469/40948820-3d15e5c2-6830-11e8-81d4-ecfaffee0a14.png">                                                       |                                   ![discrete](https://img.shields.io/badge/-discrete-brightgreen)     ![image](https://img.shields.io/badge/-image-red)                                   |     [code](./examples/super_mario/)     |
 |                                                                                                       [Gym Retro](https://github.com/openai/retro)<br>  <img width="300px" height="auto" src="./docs/images/gym-retro.jpg">                                                                                                       |                                   ![discrete](https://img.shields.io/badge/-discrete-brightgreen)     ![image](https://img.shields.io/badge/-image-red)                                   |        [code](./examples/retro/)        |