* Small adjustment on sing_out function
First, thanks for this. It has been a great help. I was having trouble with this function, getting a TypeError (TypeError: can only concatenate str (not "NoneType") to str) because apparently the second os.remove(session_cache_path()) is trying to delete a file that does not exist anymore so this is what worked for me.
* Change description on app.py file
* Update app.py on line 79
Fixed indent
