Update README.md

Fix typo in model name

README.md

@@ -59,7 +59,7 @@ pip install transformers torch numpy
 ```python
 from transformers import AutoModelForCausalLM, AutoTokenizer
 
-model_name = "Efficient-Large-Model/Fast_dLLM_1.5B"
+model_name = "Efficient-Large-Model/Fast_dLLM_v2_1.5B"
 
 model = AutoModelForCausalLM.from_pretrained(
     model_name,