Update URM Version to 1.4.4 and regenerated all puml files

message-channel/etc/message-channel.urm.puml

@@ -1,6 +1,7 @@
 @startuml
 package com.iluwatar.message.channel {
   class App {
+    - LOGGER : Logger {static}
     + App()
     + main(args : String[]) {static}
   }