Update README.md with new model card content

README.md

@@ -100,7 +100,7 @@ labels = [0, 3]
 
 # Pretrained classifier.
 classifier = keras_nlp.models.RobertaClassifier.from_preset(
-    "roberta_base_en",
+    "hf://keras/roberta_base_en",
     num_classes=4,
 )
 classifier.fit(x=features, y=labels, batch_size=2)
@@ -128,7 +128,7 @@ labels = [0, 3]
 
 # Pretrained classifier without preprocessing.
 classifier = keras_nlp.models.RobertaClassifier.from_preset(
-    "roberta_base_en",
+    "hf://keras/roberta_base_en",
     num_classes=4,
     preprocessor=None,
 )