Added Genre() to Metadata interface

README.md

@@ -16,6 +16,7 @@ Parsed metadata is exported via a single interface (giving a consistent API for
     	Artist() string
     	AlbumArtist() string
     	Composer() string
+    	Genre() string
     	Year() int
 
     	Track() (int, int) // Number, Total

tag.go

@@ -100,6 +100,9 @@ type Metadata interface {
 	// Year returns the year of the track.
 	Year() int
 
+	// Genre returns the genre of the track.
+	Genre() string
+
 	// Track returns the track number and total tracks, or zero values if unavailable.
 	Track() (int, int)
 

tag/tag.go

@@ -67,6 +67,7 @@ func printMetadata(m tag.Metadata) {
 	fmt.Printf(" Album: %v\n", m.Album())
 	fmt.Printf(" Artist: %v\n", m.Artist())
 	fmt.Printf(" Composer: %v\n", m.Composer())
+	fmt.Printf(" Genre: %v\n", m.Genre())
 	fmt.Printf(" Year: %v\n", m.Year())
 
 	track, trackCount := m.Track()