Update usage help

README.md

@@ -89,8 +89,9 @@ but make sure `python -V` gives you a `Python 3.x.x`!
 ```
 usage: spotdl.py [-h]
                  (-s SONG | -l LIST | -p PLAYLIST | -b ALBUM | -u USERNAME)
-                 [-m] [-nm] [-a] [-f FOLDER] [-v] [-i INPUT_EXT]
-                 [-o OUTPUT_EXT] [-ll {INFO,WARNING,ERROR,DEBUG}]
+                 [-m] [-nm] [-a] [-f FOLDER] [--overwrite {skip,force,prompt}]
+                 [-i INPUT_EXT] [-o OUTPUT_EXT] [-dm] [-d] [-mo]
+                 [-ll {INFO,WARNING,ERROR,DEBUG}]
 
 Download and convert songs from Spotify, Youtube etc.
 
@@ -114,15 +115,17 @@ optional arguments:
   -f FOLDER, --folder FOLDER
                         path to folder where files will be stored in (default:
                         Music/)
-  --overwrite {prompt,force,skip}
+  --overwrite {skip,force,prompt}
                         change the overwrite policy (default: prompt)
-
   -i INPUT_EXT, --input-ext INPUT_EXT
                         prefered input format .m4a or .webm (Opus) (default:
                         .m4a)
   -o OUTPUT_EXT, --output-ext OUTPUT_EXT
                         prefered output extension .mp3 or .m4a (AAC) (default:
                         .mp3)
+  -dm, --download-only-metadata
+                        download songs for which metadata is found (default:
+                        False)
   -d, --dry-run         Show only track title and YouTube URL (default: False)
   -mo, --music-videos-only
                         Search only for music on Youtube (default: False)