ReleaseNotes in sup-0.15.0 vs ReleaseNotes in sup-0.15.1

@@ -1,4 +1,8 @@
+Release 0.15.1:
+
+Sort threads last-activity-first and bug fix.
+
 Release 0.15.0:
 
 Maildir Syncback has been included. Refer to the wiki for more information on
 how to set it up.