readme: fix model usage

README.md

@@ -20,6 +20,9 @@ The following snippet shows how to use this model:
 ```python
 from wtpsplit import WtP
 
+model = WtP(model_name_or_model="wtp-canine-s-de-hist-12l",
+            hub_prefix="stefan-it")
+
 model.split("Das ist einer schöner Tag... Wie geht es dir?",
             lang_code="de", style="digibok")
 ```