[devhelp] App: update copyright in about dialog for 2019

[Sébastien Wilmet <swilmet src gnome org>]

commit bb0a8405802a4dbc74d14a166d1b3e3b17692f3a
Author: Sébastien Wilmet <swilmet gnome org>
Date:   Mon Jun 3 10:07:29 2019 +0200

    App: update copyright in about dialog for 2019

 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 6b3387cd..5b5f8eb6 100644
--- a/src/dh-app.c
+++ b/src/dh-app.c
@@ -276,7 +276,7 @@ about_cb (GSimpleAction *action,
                                "website-label", _("Devhelp Website"),
                                "logo-icon-name", "org.gnome.Devhelp",
                                "license-type", GTK_LICENSE_GPL_3_0,
-                               "copyright", "Copyright 2001-2018 – the Devhelp team",
+                               "copyright", "Copyright 2001-2019 – the Devhelp team",
                                NULL);
 }