Fix NULL chars in string while reading id3v11 tags

util.go

@@ -5,6 +5,7 @@
 package tag
 
 import (
+	"bytes"
 	"encoding/binary"
 	"io"
 )
@@ -46,7 +47,7 @@ func readString(r io.Reader, n int) (string, error) {
 	if err != nil {
 		return "", err
 	}
-	return string(b), nil
+	return string(bytes.Trim(b, "\x00")), nil
 }
 
 func readInt(r io.Reader, n int) (int, error) {