Update README.md

Author: pythonlessons

RL-Bitcoin-trading-bot_4/README.md

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-# Reinforcement Learning Bitcoin Trading Bot #3
+# Reinforcement Learning Bitcoin Trading Bot #4
 Trying to create Reinforcement Learning powered Bitcoin trading bot
 
 Text version tutorial: [https://pylessons.com/RL-BTC-BOT-NN/](https://pylessons.com/RL-BTC-BOT-reward/)