Fixed collection statistics bug

Change-Id: If8633847ea454c8f0510d853d76691edd67e66b9
diff --git a/Changes b/Changes
index 7435d58..fe5d4f3 100644
--- a/Changes
+++ b/Changes
@@ -1,4 +1,4 @@
-0.53 2015-07-30
+0.53 2015-07-31
         - [feature] Implemented new KrillCollection (diewald)
 	  This should fix a lot of issues with deleted
 	  documents and negation in virtual collections.
@@ -6,6 +6,7 @@
 	- [cleanup] REMOVED deprecated termRelation API (diewald)
 	- [feature] Added removal methods for documents (diewald)
 	- [cleanup] REMOVED search method in KrillCollection (diewald)
+        - [bugfix] Fixed collection statistics (diewald)
 
 0.52 2015-07-08
         - [bugfix] Fixed payload filtering in FocusSpans (margaretha)