Update app description

fastlane/metadata/android/en-US/full_description.txt

@@ -7,21 +7,13 @@ The project is currently in an unstable stage. If you encounter bugs, please rep
 <br><b>Features:</b>
 
 * Play songs without ads
-* Browse almost any YouTube Music page
-* Search songs, albums, videos and playlists from YouTube Music
-* Open YouTube Music links
-* Save songs, albums and playlists in local database
 * Download music for offline playback
-* Edit song title
-* Add links to your favorite YouTube Music playlists
-* Material design player
-* Lockscreen playback
-* Media controls in notification
-* Skip to next/previous song
-* Repeat/shuffle mode
-* Edit now-playing queue
-* Custom themes
-* Dark theme
-* Localization
-* Proxy
-* Backup & restore
+* Local library management
+* Export downloaded songs via SAF
+* Cache songs
+* (Synchronized) lyrics
+* Audio normalization
+* Skip silence
+* Backup & restore
+* Support proxy
+* Support Android Auto