chore: reduces number of topics to 5

Author: Crazelu

pubspec.yaml

@@ -3,7 +3,7 @@ description: A library for synchronizing subtitles for video and audio playback.
 version: 1.0.0
 repository: https://github.com/crazelu/subtitle_player
 issue_tracker: https://github.com/Crazelu/subtitle_player/issues
-topics: [subtitle, webvtt, lrc, subrip, srt, audio, video]
+topics: [subtitle, webvtt, srt, audio, video]
 
 environment:
   sdk: ">=2.17.1 <4.0.0"