Add 0.3.1 fixes to Changelog

ChangeLog

@@ -2,6 +2,15 @@ Version 0.3.1:
     * Fixed not resolving to local files.
     * Fixed shutdown crash on Windows.
     * Support more widget types in Javascript resolver configs.
+    * Fixed bug where red headphone would be visible on My Collection
+      when listened along to source went offline.
+    * Draw author name as well as avatar in recently played playlists.
+    * Fixed Tomahawk integration in Unity.
+    * Fixed incorrect item selected in source tree when deleting temporary
+      pages.
+    * Fixed currently played label disappearing after 10 minutes regardless
+      of length of track.
+    * Fixed crash on Sparkle upgrade on OS X.
 
 Version 0.3.0:
     * Make artist names in the album view clickable.