Update README.md

README.md

@@ -13,7 +13,7 @@ Its main task is to perform the [Natural Language Inference (NLI)](https://nlp.s
 ## Usage #1 (HuggingFace Transformers)
 In the environment on which you want to run the project, type:
 ```markdown
-pip install -i https://test.pypi.org/simple/ ispin==0.1.1
+pip install --extra-index-url https://test.pypi.org/simple/ ispin==0.1.3
 ```
 
 ## Retrieve embeddings