Update README.md with the full model name

The current code returns:
```
huggingface_hub.errors.RepositoryNotFoundError: 401 Client Error. (Request ID: Root=1-683b28c0-711c03c11db8e3f476c2852b;30ceaae5-3e5f-41c6-a908-fd8622e433f4)

Repository Not Found for url: https://huggingface.co/potion-multilingual-128M/resolve/main/model.safetensors.
```

README.md

@@ -141,7 +141,7 @@ Load this model using the `from_pretrained` method:
 from model2vec import StaticModel
 
 # Load a pretrained Model2Vec model
-model = StaticModel.from_pretrained("potion-multilingual-128M")
+model = StaticModel.from_pretrained("minishlab/potion-multilingual-128M")
 
 # Compute text embeddings
 embeddings = model.encode(["Example sentence"])