GUACAMOLE-693: Merge update to NOTICE copyright year (2018 -> 2019).
GUACAMOLE-693: Merge update to NOTICE copyright year (2018 -> 2019).


apache/guacamole-server,apache/guacamole-server,mike-jumper/incubator-guacamole-server,glyptodon/guacamole-server,apache/guacamole-server,mike-jumper/incubator-guacamole-server,mike-jumper/incubator-guacamole-server,glyptodon/guacamole-server,glyptodon/guacamole-server,mike-jumper/incubator-guacamole-server