gzip instead of bzip change to stories download

examples/stories/README.md

@@ -5,7 +5,7 @@ The following commands provide an example of pre-processing data, training a mod
 The dataset can be downloaded like this:
 
 ```
-curl https://s3.amazonaws.com/fairseq-py/data/writingPrompts.tar.gz | tar xvjf -
+curl https://s3.amazonaws.com/fairseq-py/data/writingPrompts.tar.gz | tar xvzf -
 ```
 
 and contains a train, test, and valid split. The dataset is described here: https://arxiv.org/abs/1805.04833, where only the first 1000 words of each story are modeled.