Update README.md

gpl/toolkit/README.md

@@ -9,7 +9,7 @@ This is because:
 However, the last layer of "facebook/dpr-question_encoder-single-nq-base" is actually a dense linear (with an activation function).
 
 To start from these checkpoints, one need to transform them into SBERT-format. We here provide two examples in [reformat.py](./reformat.py) to transform `simcse_like` and `dpr_like` models into SBERT-format. For example, one can run:
-```python
+```bash
 python -m gpl.toolkit.reformat \
     --template "dpr_like" \
     --model_name_or_path "facebook/dpr-question_encoder-single-nq-base" \