Changed colab link

Fixed the colab notebook link.

Author: dalequark

README.md

@@ -4,7 +4,7 @@
 
 BERT has been uploaded to [TensorFlow Hub](https://tfhub.dev). See
 `run_classifier_with_tfhub.py` for an example of how to use the TF Hub module, 
-or run an example in the browser on [Colab](https://colab.sandbox.google.com/github/google-research/bert/predicting_movie_reviews_with_bert_on_tf_hub.ipynb).
+or run an example in the browser on [Colab](https://colab.sandbox.google.com/github/google-research/bert/blob/master/predicting_movie_reviews_with_bert_on_tf_hub.ipynb).
 
 **\*\*\*\*\* New November 23rd, 2018: Un-normalized multilingual model + Thai +
 Mongolian \*\*\*\*\***