#39 Playlist error on Youtube when playlist name contains encoding char

UnicodeWarning: Unicode equal comparison failed to convert both arguments to Unicode - interpreting them as being unequal
  if playlist["snippet"]['title'] == playlist_name:

When uploading a video and trying to add it to a existing playlist, the compare function failed if the playlist contains a encoding char. Example error with a `à`: ``` UnicodeWarning: Unicode equal comparison failed to convert both arguments to Unicode - interpreting them as being unequal if playlist["snippet"]['title'] == playlist_name: ``` Error is in `lib/yt_upload.py` on line `171`. Should test if encoding to utf8 as done in peertube lib solve the problem.