Update README.md

README.md

@@ -11,8 +11,7 @@ Following algorithms are supported:
 
 |                          Algorithm                           | Dicrete action | Continuous action |                  Support                   | Category                 |
 | :----------------------------------------------------------: | :------------: | :---------------: | :----------------------------------------: | ------------------------ |
-| [VPG](https://papers.nips.cc/paper/1713-policy-gradient-methods-for-reinforcement-learning-with-function-approximation.pdf) |       ✓        |         ✓         |  [GAE](https://arxiv.org/abs/1506.02438)   | Model-free On-policy RL  |
-|          [PPO](<https://arxiv.org/abs/1707.06347>)           |       ✓        |         ✓         |  [GAE](https://arxiv.org/abs/1506.02438)   | Model-free On-policy RL  |
+| [VPG](https://papers.nips.cc/paper/1713-policy-gradient-methods-for-reinforcement-learning-with-function-approximation.pdf), [PPO](<https://arxiv.org/abs/1707.06347>) |       ✓        |         ✓         |  [GAE](https://arxiv.org/abs/1506.02438)   | Model-free On-policy RL  |
 | [DQN](https://storage.googleapis.com/deepmind-media/dqn/DQNNaturePaper.pdf) (including [DDQN](https://arxiv.org/abs/1509.06461), [Prior. DQN](https://arxiv.org/abs/1511.05952), [Duel. DQN](https://arxiv.org/abs/1511.06581), [Distrib. DQN](<https://arxiv.org/abs/1707.06887>), [Noisy DQN](<https://arxiv.org/abs/1706.10295>)) |       ✓        |         -         | [ApeX](<https://arxiv.org/abs/1803.00933>) | Model-free Off-policy RL |
 | [DDPG](https://arxiv.org/abs/1509.02971) (including [TD3](<https://arxiv.org/abs/1802.09477>), [BiResDDPG](<https://arxiv.org/abs/1905.01072>)) |       -        |         ✓         | [ApeX](<https://arxiv.org/abs/1803.00933>) | Model-free Off-policy RL |
 |          [SAC](<https://arxiv.org/abs/1801.01290>)           |       -        |         ✓         | [ApeX](<https://arxiv.org/abs/1803.00933>) | Model-free Off-policy RL |