[easytag/easytag-2-2] Document libid3tag requirement in README

[David King <davidk src gnome org>]

commit 79040333844d000f958bb666e1358ec0b7376a17
Author: David King <amigadave amigadave com>
Date:   Tue Apr 15 14:43:40 2014 +0100

    Document libid3tag requirement in README

 README |    3 ++-
 1 files changed, 2 insertions(+), 1 deletions(-)
---
diff --git a/README b/README
index 0e16fe7..d345ae2 100644
--- a/README
+++ b/README
@@ -56,7 +56,8 @@ Installation
 
 * GLib version greater than 2.30.0 (http://www.gtk.org)
 * GTK+ version greater than 2.24.0 (http://www.gtk.org)
-* id3lib version greater than 3.7.12 (http://id3lib.sourceforge.net) (Recommended: id3lib-3.8.3)
+* libid3tag (http://www.underbit.com/products/mad) (if not deactivated by './configure --disable-mp3')
+* id3lib version greater than 3.7.12 (http://id3lib.sourceforge.net) (Recommended: id3lib-3.8.3) (if not 
deactivated by './configure --disable-id3v23')
 * flac (http://flac.sourceforge.net) (if not deactivated by './configure --disable-flac')
 * libogg and libvorbis (http://www.vorbis.com) (if not deactivated by './configure --disable-ogg')
 * opus and opusfile (http://www.opus-codec.org/) (if not deactivated by './configure --disable-opus')