Implemented referencing cached collection.

Change-Id: I02f2ee84b3f8e50c5632efc9363eb87d97a754f8
diff --git a/Changes b/Changes
index 50d7f41..0e620b5 100644
--- a/Changes
+++ b/Changes
@@ -1,3 +1,6 @@
+0.58 2018-07-24
+        - Implemented referencing cached collection (margaretha)
+
 0.57 2018-04-05
         - [feature] Support text queries in metadata
           (requires reindexing to work properly; diewald)