Update usage examples

README.md

@@ -36,7 +36,9 @@ from transformers_keras import Bert
 # Used to predict directly
 model = Bert.from_pretrained('/path/to/pretrained/bert/model')
 # segment_ids and mask inputs are optional
-model.predict(inputs=(input_ids, segment_ids, mask))
+model.predict((input_ids, segment_ids, mask))
+# or
+model(inputs=(input_ids, segment_ids, mask))
 
 # Used to fine-tuning
 def build_bert_classify_model(trainable=True):
@@ -70,7 +72,9 @@ from transformers_keras import Albert
 # Used to predict directly
 model = Bert.from_pretrained('/path/to/pretrained/albert/model')
 # segment_ids and mask inputs are optional
-model(model.dummy_inputs())
+model.predict((input_ids, segment_ids, mask))
+# or
+model(inputs=(input_ids, segment_ids, mask))
 
 # Used to fine-tuning 
 def build_albert_classify_model(trainable=True):