update

Author: lmorillas

README.md

@@ -36,7 +36,7 @@ See [contributing](https://github.com/lmorillas/learn-python3/blob/master/CONTRI
 1. **Functions** [[notebook]](http://nbviewer.jupyter.org/github/lmorillas/learn-python3/blob/master/notebooks/beginner/notebooks/functions.ipynb) [[exercise]](http://nbviewer.jupyter.org/github/lmorillas/learn-python3/blob/master/notebooks/beginner/exercises/functions_exercise.ipynb)
 1. **Testing with pytest** [[notebook]](http://nbviewer.jupyter.org/github/lmorillas/learn-python3/blob/master/notebooks/beginner/notebooks/testing1.ipynb) [[exercise]](http://nbviewer.jupyter.org/github/lmorillas/learn-python3/blob/master/notebooks/beginner/exercises/testing1_exercise.ipynb)
 1. **Recap exercise 1** [[exercise]](http://nbviewer.jupyter.org/github/lmorillas/learn-python3/blob/master/notebooks/beginner/exercises/recap1_exercise.ipynb)
-1. **File I\O ** [[notebook]](http://nbviewer.jupyter.org/github/lmorillas/learn-python3/blob/master/notebooks/beginner/notebooks/file_io.ipynb) [[exercise]](http://nbviewer.jupyter.org/github/lmorillas/learn-python3/blob/master/notebooks/beginner/exercises/file_io_exercise.ipynb)
+1. **File I\O** [[notebook]](http://nbviewer.jupyter.org/github/lmorillas/learn-python3/blob/master/notebooks/beginner/notebooks/file_io.ipynb) [[exercise]](http://nbviewer.jupyter.org/github/lmorillas/learn-python3/blob/master/notebooks/beginner/exercises/file_io_exercise.ipynb)
 1. **Classes** [[notebook]](http://nbviewer.jupyter.org/github/lmorillas/learn-python3/blob/master/notebooks/beginner/notebooks/classes.ipynb) [[exercise]](http://nbviewer.jupyter.org/github/lmorillas/learn-python3/blob/master/notebooks/beginner/exercises/classes_exercise.ipynb)
 1. **Exceptions** [[notebook]](http://nbviewer.jupyter.org/github/lmorillas/learn-python3/blob/master/notebooks/beginner/notebooks/exceptions.ipynb) [[exercise]](http://nbviewer.jupyter.org/github/lmorillas/learn-python3/blob/master/notebooks/beginner/exercises/exceptions_exercise.ipynb)
 1. **Modules and packages** [notebook]](http://nbviewer.jupyter.org/github/lmorillas/learn-python3/blob/master/notebooks/beginner/notebooks/modules_and_packages.ipynb)