add formatting to code blocks

README.md

@@ -34,11 +34,15 @@ widget:
 
 ## usage in python
 
-install transformers as needed: `pip install -U transformers`
-
-run the following, changing the example text to your use case:
+install transformers as needed: 
 
+```bash
+pip install -U transformers`
 ```
+
+Run the following, changing the example text to your use case:
+
+```python
 from transformers import pipeline
 
 model_tag = "ml4pubmed/BiomedNLP-PubMedBERT-base-uncased-abstract-fulltext_pub_section"