update copyright and opensource information

Author: hillin

TankInspector/UIComponents/CreditsView.xaml

@@ -23,7 +23,7 @@
                     <StackPanel Margin="24,150,25,0" VerticalAlignment="Top">
                         <Button Style="{StaticResource LinkButton}" HorizontalAlignment="Left" Click="WebsiteLink_Click" x:Uid="WebsiteLink" ToolTip="Visit our Website" Content="Visit our Website"/>
 
-                        <TextBlock Margin="0,15,0,0" x:Uid="CopyrightInfo" Text="Copyright © 2013 - 2014, Smellyriver." />
+                        <TextBlock Margin="0,15,0,0" x:Uid="CopyrightInfo" Text="Copyright © 2013 - 2017, Smellyriver. Open source under the MIT licence." />
                         <StackPanel  Orientation="Horizontal" Margin="0,5,0,0">
                             <TextBlock x:Uid="ProductVersion" Text="Product Version" />
                             <TextBlock Text=": " />