Updated bug in TensorFlow usage code (README.md)

The TensorFlow example usage code had a missing closing quotation mark around the `TFAlbertModel.from_pretrained` function call. This change adds the missing quotation mark.

README.md

@@ -114,7 +114,7 @@ and in TensorFlow:
 ```python
 from transformers import AlbertTokenizer, TFAlbertModel
 tokenizer = AlbertTokenizer.from_pretrained('albert-base-v2')
-model = TFAlbertModel.from_pretrained("albert-base-v2)
+model = TFAlbertModel.from_pretrained("albert-base-v2")
 text = "Replace me by any text you'd like."
 encoded_input = tokenizer(text, return_tensors='tf')
 output = model(encoded_input)