[gnome-chess] Update about dialog

[Sahil Sareen <ssareen src gnome org>]

commit 678d6e81e2b41aa265ec567e621b1abd2dee1c0e
Author: Sahil Sareen <sahil sareen hotmail com>
Date:   Sat Mar 12 22:23:47 2016 +0530

    Update about dialog

 src/gnome-chess.vala |    5 ++++-
 1 files changed, 4 insertions(+), 1 deletions(-)
---
diff --git a/src/gnome-chess.vala b/src/gnome-chess.vala
index cdbca52..4213bb3 100644
--- a/src/gnome-chess.vala
+++ b/src/gnome-chess.vala
@@ -65,6 +65,9 @@ public class ChessApplication : Gtk.Application
     private ChessPlayer? human_player = null;
     private ChessEngine? opponent_engine = null;
     private int engine_timeout_counter = 10;
+    private string copyrights = """Copyright © 2010–2013 Robert Ancell
+Copyright © 2013–2014 Michael Catanzaro
+Copyright © 2015–2016 Sahil Sareen""";
 
     private const ActionEntry[] app_entries =
     {
@@ -2184,7 +2187,7 @@ public class ChessApplication : Gtk.Application
         about_dialog.modal = true;
         about_dialog.program_name = _("Chess");
         about_dialog.version = VERSION;
-        about_dialog.copyright = "Copyright © 2010–2013 Robert Ancell\nCopyright © 2013–2014 Michael 
Catanzaro";
+        about_dialog.copyright = copyrights;
         about_dialog.license_type = Gtk.License.GPL_3_0;
         about_dialog.comments = _("A classic game of positional strategy");
         about_dialog.authors = authors;