Update README.md

Rohan138 · web-flow · commit 6b1ae3ceb915 · 2021-11-25T10:26:16.000-05:00
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 # MARL-Baselines3
 Multi-Agent Reinforcement Learning with [Stable-Baselines3](https://github.com/DLR-RM/stable-baselines3)
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+(Note: This repository is a work in progress and currently only has Independent PPO implemented)
