Drop Vorbis as planned feature

It's not as good as Opus. MP3 was added because it's popular, and Flac
provides a good lossless codec.
Vorbis can be added at a later date.

Signed-off-by: Mahyar Koshkouei <deltabeard@users.noreply.github.com>

README.md

@@ -36,7 +36,6 @@ Start = Return to Homebrew menu (Only when stopped playing).
 ### Planned features
 * Playlist support.
 * Repeat and shuffle support.
-* OGG file support.
 * Metadata support.
 * Gain support.
 

source/playback.c

@@ -234,7 +234,7 @@ int getFileType(const char *file)
 			else
 			{
 				file_type = FILE_TYPE_OGG;
-				printf("\nFile type is OGG.");
+				printf("\nUnsupported audio in OGG container.");
 			}
 
 			break;