Update Readme.md to use correct peft library syntax.

README.md

@@ -20,7 +20,7 @@ base_model = AutoModelForCausalLM.from_pretrained(
 )
 tokenizer = AutoTokenizer.from_pretrained('meta-llama/Llama-2-7b-chat-hf')
 
-model = PeftModel.from_pretrained('FinGPT/fingpt-forecaster_dow30_llama2-7b_lora')
+model = PeftModel.from_pretrained(base_model, 'FinGPT/fingpt-forecaster_dow30_llama2-7b_lora')
 model = model.eval()
 ```