[four-in-a-row/KaKnife/four-in-a-row-vala: 28/65] fix issue with app menu

[Michael Catanzaro <mcatanzaro src gnome org>]

commit 5bb328e0cf505c72f78f5165dd85a53f7150e3f4
Author: Jacob Humphrey <jacob ryan humphrey gmail com>
Date:   Sun Dec 9 21:43:03 2018 -0600

    fix issue with app menu

 src/main.vala | 9 +++++----
 1 file changed, 5 insertions(+), 4 deletions(-)
---
diff --git a/src/main.vala b/src/main.vala
index facace6..fd5c543 100644
--- a/src/main.vala
+++ b/src/main.vala
@@ -667,9 +667,10 @@ class FourInARow : Gtk.Application {
         Gtk.show_about_dialog(window,
             name: _(Config.APPNAME_LONG),
             version: Config.VERSION,
-            copyright: "Copyright © 1999–2008 Tim Musson and David Neary" +
-                       "Copyright © 2014 Michael Catanzaro\nCopyright © 2018 Jacob Humphrey",
-            license_type: Gtk.License.GPL_2_0,
+            copyright: "Copyright © 1999–2008 Tim Musson and David Neary\n" +
+                       "Copyright © 2014 Michael Catanzaro\n" +
+                       "Copyright © 2018 Jacob Humphrey",
+            license_type: Gtk.License.GPL_3_0,
             comments: _("Connect four in a row to win"),
             authors: authors,
             documenters: documenters,
@@ -752,7 +753,7 @@ class FourInARow : Gtk.Application {
         section.append(_("_About"), "app.about");
         section.append(_("_Quit"), "app.quit");
 
-        app_menu = app_menu;
+        this.app_menu = app_menu;
 
         frame = builder.get_object("frame") as Gtk.AspectFrame;