Update README.md

Code was downloading 7b model instead of 3b.

README.md

@@ -27,8 +27,8 @@ Get started chatting with `StableLM-Tuned-Alpha` by using the following code sni
 ```python
 from transformers import AutoModelForCausalLM, AutoTokenizer, StoppingCriteria, StoppingCriteriaList
 
-tokenizer = AutoTokenizer.from_pretrained("StabilityAI/stablelm-tuned-alpha-7b")
-model = AutoModelForCausalLM.from_pretrained("StabilityAI/stablelm-tuned-alpha-7b")
+tokenizer = AutoTokenizer.from_pretrained("StabilityAI/stablelm-tuned-alpha-3b")
+model = AutoModelForCausalLM.from_pretrained("StabilityAI/stablelm-tuned-alpha-3b")
 model.half().cuda()
 
 class StopOnTokens(StoppingCriteria):