Update README.md

README.md

@@ -35,7 +35,7 @@ If you want to contact us & join us, you can  ✉️  to our team : <opendilab@p
 | :-------------: | :-------------: | :------------------------: | :------------: | :--------------: | :------------: | :------------------: | :---------: | :---------: | :---------: |
 | [PPO](https://arxiv.org/pdf/1707.06347.pdf) | [✅](https://huggingface.co/OpenDILabCommunity/Lunarlander-v2-PPO) | | | [✅](https://huggingface.co/OpenDILabCommunity/PongNoFrameskip-v4-PPO) | | | [✅](https://huggingface.co/OpenDILabCommunity/Hopper-v3-PPO) | | |
 | [PG](https://proceedings.neurips.cc/paper/1999/file/464d828b85b0bed98e80ade0a5c43b0f-Paper.pdf) | ⏳ | | | | | | ⏳ | | |
-| [A2C](https://arxiv.org/pdf/1602.01783.pdf) | [✅](https://huggingface.co/OpenDILabCommunity/Lunarlander-v2-A2C) | [✅](https://huggingface.co/OpenDILabCommunity/BipedalWalker-v3-A2C) | | | | | ⏳ | | |
+| [A2C](https://arxiv.org/pdf/1602.01783.pdf) | [✅](https://huggingface.co/OpenDILabCommunity/Lunarlander-v2-A2C) | [✅](https://huggingface.co/OpenDILabCommunity/BipedalWalker-v3-A2C) | | | | | [✅](https://huggingface.co/OpenDILabCommunity/Hopper-v3-A2C) | | |
 | [IMPALA](https://arxiv.org/pdf/1802.01561.pdf) | ⏳ | | | | | | ⏳ | | |
 | [DQN](https://storage.googleapis.com/deepmind-media/dqn/DQNNaturePaper.pdf) | [✅](https://huggingface.co/OpenDILabCommunity/Lunarlander-v2-DQN) | 🔓 | 🔓 | ⏳ | [✅](https://huggingface.co/OpenDILabCommunity/SpaceInvadersNoFrameskip-v4-DQN) | ⏳ | 🔓 | 🔓 | 🔓 |
 | [C51](https://arxiv.org/abs/1707.06887) | [✅](https://huggingface.co/OpenDILabCommunity/Lunarlander-v2-C51) | 🔓 | 🔓 | [✅](https://huggingface.co/OpenDILabCommunity/PongNoFrameskip-v4-C51) | [✅](https://huggingface.co/OpenDILabCommunity/SpaceInvadersNoFrameskip-v4-C51) | [✅](https://huggingface.co/OpenDILabCommunity/QbertNoFrameskip-v4-C51) | 🔓 | 🔓 | 🔓 |