Fix copyright year to 2019

plugins/UM3NetworkPrinting/resources/qml/MonitorPrintJobProgressBar.qml

@@ -1,4 +1,4 @@
-// Copyright (c) 2018 Ultimaker B.V.
+// Copyright (c) 2019 Ultimaker B.V.
 // Cura is released under the terms of the LGPLv3 or higher.
 
 import QtQuick 2.3
@@ -107,4 +107,4 @@ Item
         verticalAlignment: Text.AlignVCenter
         renderType: Text.NativeRendering
     }
-}
+}