Added 6.2.1 release to CHANGES

* v6.2.1 was released before v6.3.0 and its changes were
  cherry-picked, so instead of double-listing changes in these
  releases, v6.2.1 is added to reflect the calendar time line
  for released versions.

CHANGES

@@ -1,8 +1,13 @@
 --------------------------------------------------------------------
-6.3.0
+6.3.0 [29-Jan-2023] -- Stone Steps Inc. (www.stonesteps.ca)
 --------------------------------------------------------------------
 
  * [AB-116] Added MinVisitLength for human visits
+
+--------------------------------------------------------------------
+6.2.1 [02-Oct-2022] -- Stone Steps Inc. (www.stonesteps.ca)
+--------------------------------------------------------------------
+
  * [BUG] JSON output is erroneously encoded as JavaScript
  * [BUG] JSON output for monthly usage has an erroneous comma (github.com/YasuhiroABE)
  * [BUG] Percentages for some transfer amounts are computed incorrectly as zeros (github.com/YasuhiroABE)