[iagno] Add Shift-F1 shortcut for about dialog.

[Arnaud B. <arnaudb src gnome org>]

commit 1712b636e137ee7d569a28daf5570bd07bfbdafd
Author: Arnaud Bonatti <arnaud bonatti gmail com>
Date:   Mon Jan 7 18:31:19 2019 +0100

    Add Shift-F1 shortcut for about dialog.

 src/iagno.vala | 1 +
 1 file changed, 1 insertion(+)
---
diff --git a/src/iagno.vala b/src/iagno.vala
index 1becef8..9ec80fb 100644
--- a/src/iagno.vala
+++ b/src/iagno.vala
@@ -196,6 +196,7 @@ public class Iagno : Gtk.Application
         set_accels_for_action ("win.back",              {                 "Escape"  });
         set_accels_for_action ("win.toggle-hamburger",  {                 "F10"     });
         set_accels_for_action ("app.help",              {                 "F1"      });
+        set_accels_for_action ("app.about",             {          "<Shift>F1"      });
         add_action (settings.create_action ("sound"));
         add_action (settings.create_action ("color"));
         add_action (settings.create_action ("num-players"));