[gthumb] updated copyright year

[Paolo Bacchilega <paobac src gnome org>]

commit c59ac0c0e2230532be1bdc54bb1d9863ffa360c3
Author: Paolo Bacchilega <paobac src gnome org>
Date:   Sat Nov 23 14:26:07 2019 +0100

    updated copyright year

 gthumb/gth-browser-actions-callbacks.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/gthumb/gth-browser-actions-callbacks.c b/gthumb/gth-browser-actions-callbacks.c
index b4444a1f..fc49df0c 100644
--- a/gthumb/gth-browser-actions-callbacks.c
+++ b/gthumb/gth-browser-actions-callbacks.c
@@ -123,7 +123,7 @@ gth_browser_activate_about (GSimpleAction *action,
 
        gtk_show_about_dialog (GTK_WINDOW (browser),
                               "version", PACKAGE_VERSION,
-                              "copyright", "Copyright \xc2\xa9 2001-2013 Free Software Foundation, Inc.",
+                              "copyright", "Copyright \xc2\xa9 2001-2019 Free Software Foundation, Inc.",
                               "comments", _("An image viewer and browser for GNOME."),
                               "authors", authors,
                               "documenters", documenters,