* use newer string formatters (https://pyformat.info)
* fix typo
* went through the files again, additions from #1165 are also included
* replace .format() with f strings
* - Added scope, 'playlist-read-private', to examples that access user playlists using the spotipy api: current_user_playlists() (fixes#591)
* Fix example to use user_playlists again
Co-authored-by: Stephane Bruckert <stephane.bruckert@gmail.com>