Update README.md

changed the way showing pip install git+https://github.com/huggingface/transformers, now it is easier to see and better formatted

README.md

@@ -84,7 +84,11 @@ We have three models with 2, 7 and 72 billion parameters. This repo contains the
 
 
 ## Requirements
-The code of Qwen2-VL has been in the latest Hugging face transformers and we advise you to build from source with command `pip install git+https://github.com/huggingface/transformers`, or you might encounter the following error:
+The code of Qwen2-VL has been in the latest Hugging face transformers and we advise you to build from source with command 
+```python
+pip install git+https://github.com/huggingface/transformers
+```
+or you might encounter the following error:
 ```
 KeyError: 'qwen2_vl'
 ```