Add fingerprint method to KrillIndex (closes #62)

Change-Id: Ic9ded4e07587edfe5edde931b928c40673af0e83
diff --git a/Changes b/Changes
index c851d6d..59f093c 100644
--- a/Changes
+++ b/Changes
@@ -1,3 +1,6 @@
+0.59.2 2020-06-02
+    - [feature] Add fingerprint method to index (diewald)
+
 0.59.1 2020-04-08
     - [bugfix] Fix bug in classed group queries (diewald)
     - [bugfix] Fix bug in segments with negated components (diewald)