Update README.md

Author: pythonlessons

README.md

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 PPO and PPO_CNN agents playing Pong-v0 game:<br>
 ![PPO agent](11_Pong-v0_PPO/gameplay.gif)
 ![PPO CNN agent](11_Pong-v0_PPO/gameplay_CNN.gif)
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+*2020-10-10 added LunarLander-v2_PPO code for Tensorflow 2.3.1*:
 ![LunarLander-v2_PPO](https://github.com/pythonlessons/Reinforcement_Learning/blob/master/LunarLander-v2_PPO/gameplay.gif)
 
 1. [Deep Q Learning tutorial (DQN)](https://pylessons.com/CartPole-reinforcement-learning/)