[master] increase copyright year for the generated messages documentation

(maybe this should be automatically set to current year)

tools/system_messages.py

@@ -71,7 +71,7 @@ SEC_HEADER="""<?xml version="1.0" encoding="UTF-8"?>
     <title>BIND 10 Messages Manual</title>
 
     <copyright>
-      <year>2011-2013</year><holder>Internet Systems Consortium, Inc.</holder>
+      <year>2011-2014</year><holder>Internet Systems Consortium, Inc.</holder>
     </copyright>
 
     <abstract>