README.md in musicbrainz-0.7.3 vs README.md in musicbrainz-0.7.4

@@ -78,10 +78,13 @@
 
 MusicBrainz::ReleaseGroup
 ```ruby
 # Class Methods
 MusicBrainz::ReleaseGroup.find(id)
+MusicBrainz::ReleaseGroup.find_by_artist_and_title(artist_name, title, type: 'Album')
+MusicBrainz::ReleaseGroup.search(artist_name, title)
+MusicBrainz::ReleaseGroup.search(artist_name, title, type: 'Album')
 
 # Instance Methods
 @release_group.releases
 
 # Fields
@@ -103,14 +106,18 @@
 @release.tracks
 
 # Fields
 {
   :id      => String,
+  :type    => String,
   :title   => String,
   :status  => String,
   :format  => String,
   :date    => Date,
-  :country => String
+  :country => String,
+  :asin    => String,
+  :barcode => String,
+  :quality => String
 }
 ```
 
 MusicBrainz::Track
 ```ruby