fix python code markdown

README.md

@@ -7,21 +7,18 @@ Model trained on the TinyStories Dataset, see https://arxiv.org/abs/2305.07759
 
 ------ EXAMPLE USAGE ---
 
+```python
 from transformers import AutoModelForCausalLM, AutoTokenizer, GenerationConfig
-
 model = AutoModelForCausalLM.from_pretrained('roneneldan/TinyStories-1M')
-
 tokenizer = AutoTokenizer.from_pretrained("EleutherAI/gpt-neo-125M")
 
 prompt = "Once upon a time there was"
 
 input_ids = tokenizer.encode(prompt, return_tensors="pt")
-
 # Generate completion
 output = model.generate(input_ids, max_length = 1000, num_beams=1)
-
 # Decode the completion
 output_text = tokenizer.decode(output[0], skip_special_tokens=True)
-
 # Print the generated text
-print(output_text)
+print(output_text)
+```