Generate code coverage report with Cobertura

Change-Id: I5824d4708e61cb4386a69e33b97be4f507444b46
diff --git a/Changes b/Changes
index 1690ce5..6f9132d 100644
--- a/Changes
+++ b/Changes
@@ -1,5 +1,7 @@
-0.59.3 2020-10-27
+0.59.3 2020-11-11
     - [feature] Added "missing query reference" status code (diewald)
+    - [cleanup] Added test coverage checking with
+      $ mvn cobertura:cobertura (diewald, kupietz)
 
 0.59.2 2020-07-24
     - [feature] Add fingerprint method to index (diewald)