fix bugs!

go/mp3/main.go

@@ -34,6 +34,7 @@ func set()*cobra.Command{
 			if err != nil {
 				panic(err)
 			}
+			mp3File.SetDefaultEncoding(id3v2.EncodingUTF16)
 			if artist != "" {
 				mp3File.SetArtist(artist)
 			}
@@ -79,7 +80,9 @@ func main(){
 		Short: "show [file]",
 		Args: cobra.ExactArgs(1),
 		Run: func(cmd *cobra.Command, args []string) {
-			show(args[0])
+			if err := show(args[0]); err != nil {
+				panic(err)
+			}
 		},
 	}
 	cmd.AddCommand(showCmd, set())