[docs] NOT SAVE FILE OWING TO AN ENCODING ERROR

[Rosa Maria]

I made a program to read which files are in a windows folder, and saves in a file in order to print it, but when it tries to write in a file the following error appears:    

UnicodeEncodeError: 'charmap' codec can't encode character '\u2010' in position 8: character maps to <undefined>
I extpected that being Python-3 an utf8 native, I do'n have this problems. I send the Python script and some examples of files to read.
   
   - "Que tengamos Sabiduría para no temer a las Sombras de la Noche"
   - "Cuídate de la Ciencia que no Llora, de la Filosofía que no Ríe y de la Grandeza que no se inclina ante los niños"
   - "Madre es el nombre de dios en los labios y en los corazones de todos los niños"
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