Update readme

README.md

@@ -11,7 +11,11 @@ You can run the script from the command line:
 
 or, to get a JSON dump, use:
 
-    python spotify-backup.py playlists.json
+    python spotify-backup.py playlists.json --format=json
+
+By default, it includes your playlists. To include your Liked Songs, you can use:
+
+    python spotify-backup.py playlists.txt --dump=liked,playlists
 
 
 If for some reason the browser-based authorization flow doesn't work, you can also [generate an OAuth token](https://developer.spotify.com/web-api/console/get-playlists/) on the developer site (with the `playlist-read-private` permission) and pass it with the `--token` option.

spotify-backup.py

@@ -133,7 +133,7 @@ def main():
 	                                           + ' an OAuth token with the --token option.')
 	parser.add_argument('--token', metavar='OAUTH_TOKEN', help='use a Spotify OAuth token (requires the '
 	                                                         + '`playlist-read-private` permission)')
-	parser.add_argument('--dump', default='playlists', choices=['liked,playlists', 'playlists', 'liked'],
+	parser.add_argument('--dump', default='playlists', choices=['liked,playlists', 'playlists,liked', 'playlists', 'liked'],
 	                    help='dump playlists or liked songs, or both (default: playlists)')
 	parser.add_argument('--format', default='txt', choices=['json', 'txt'], help='output format (default: txt)')
 	parser.add_argument('file', help='output filename', nargs='?')