Improve test coverage for date picker and improve code

Change-Id: I9e6756fd555140739edc0318b8fb7e9fbe39ea8b
diff --git a/Changes b/Changes
index bbccd2b..fd5a054 100755
--- a/Changes
+++ b/Changes
@@ -3,6 +3,8 @@
         - add roll() method to state object.
         - Fix wrong hint-mirror behaviour in Firefox.
         - Fix VC fragments for redundant constraints.
+        - Modernize ES and improve variable declarations.
+        - Improve JS test coverage for Datepicker.
 
 0.39 2020-10-07
         - Add information on secret file to Readme.