[devhelp] App: update copyright in about dialog for 2021

[Sébastien Wilmet <swilmet src gnome org>]

commit bfff70a6a0cb263f6d330944ad121499d2d35261
Author: Sébastien Wilmet <sw swilmet be>
Date:   Fri Jan 1 07:28:03 2021 +0100

    App: update copyright in about dialog for 2021

 src/dh-app.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/src/dh-app.c b/src/dh-app.c
index 57a38243..00c5f64a 100644
--- a/src/dh-app.c
+++ b/src/dh-app.c
@@ -274,7 +274,7 @@ about_cb (GSimpleAction *action,
                                "website-label", _("Devhelp Website"),
                                "logo-icon-name", "org.gnome.Devhelp",
                                "license-type", GTK_LICENSE_GPL_3_0,
-                               "copyright", "Copyright 2001-2020 – the Devhelp team",
+                               "copyright", "Copyright 2001-2021 – the Devhelp team",
                                NULL);
 }