Update setup.md

Author: Moshe Looks

tensorflow_fold/g3doc/setup.md

@@ -51,7 +51,7 @@ Install the pip for Fold. For Python 2.7, this will be:
 pip install https://storage.googleapis.com/tensorflow_fold/tensorflow_fold-0.0.1-cp27-none-linux_x86_64.whl
 ```
 
-For Python 3.3:
+For Python 3.3+:
 
 ```
 pip3 install https://storage.googleapis.com/tensorflow_fold/tensorflow_fold-0.0.1-py3-none-linux_x86_64.whl