Update dependency to recent version of Mojo

Change-Id: Ifddf658be80fe5da61211422a306c53ec77593b7
diff --git a/Changes b/Changes
index 126a723..400d0cf 100755
--- a/Changes
+++ b/Changes
@@ -1,4 +1,4 @@
-0.42 2021-05-19
+0.42 2021-06-09
         - Added GitHub based CI for perl.
         - Added further methods for communicating JSON Files
           with the server to the APIs (lerepp).
@@ -16,6 +16,10 @@
           and getElementsById instead of child accessors
           (lerepp).
         - List tokens of a client.
+        - Upgrade Mojolicious dependency to 9.19.
+
+        WARNING: Upgrading to Mojolicious 9.19 will
+          invalidate all sessions. This is a security update.
 
 0.41 2021-03-01
         - Introduce CORS headers to the proxy.