Fix bug in classed group queries

Change-Id: Ie7713203ecca31ce06d535054608fca3c4d445e5
diff --git a/Changes b/Changes
index 1b8d321..60ba114 100644
--- a/Changes
+++ b/Changes
@@ -1,4 +1,5 @@
-0.59.1 2019-01-20
+0.59.1 2020-01-28
+    - [bugfix] Fix bug in classed group queries (diewald)
 
 0.59.0 2019-11-28
     - [bugfix] Fix offset retrieval in concurrent searches