Update README.md

README.md

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 # ChatRWKV
 ChatRWKV is like ChatGPT but powered by my RWKV (100% RNN) language model, which is the only RNN (as of now) that can match transformers in quality and scaling, while being faster and saves VRAM. Training sponsored by Stability EleutherAI :)
 
+**Please upgrade to latest code. Got a very serious bug in computation earlier.**
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 **Download RWKV-4 weights:** https://huggingface.co/BlinkDL (**Use RWKV-4 models**. DO NOT use RWKV-4a and RWKV-4b models.)
 
 **RWKV LM:** https://github.com/BlinkDL/RWKV-LM (explanation, fine-tuning, training, etc.)