Fixed up the indexing a bit

README.md

@@ -28,8 +28,12 @@ drift index /path/to/music
 
 Scans for tagged files, fetches similar artists and top tracks from Last.fm, and stores everything in a local SQLite database (`~/.local/share/drift/drift.db`).
 
+Stale tracks (files previously indexed but no longer on disk) are automatically removed.
+
 Flags:
-- `-v` — print progress
+- `-v` — print new artists indexed + summary
+- `-vv` — also print each track added/removed
+- `-vvv` — also print skipped artists
 - `-f` — re-index artists that were already indexed
 
 ### Build a playlist