[devhelp] Update copyright for 2020 in about dialog

[Sébastien Wilmet <swilmet src gnome org>]

commit 09a017a9f6b315ad65de1557c51c98798531bc05
Author: Sébastien Wilmet <swilmet gnome org>
Date:   Thu Jan 30 12:38:32 2020 +0100

    Update copyright for 2020 in about dialog

 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 f1b0c694..91e9c810 100644
--- a/src/dh-app.c
+++ b/src/dh-app.c
@@ -262,7 +262,7 @@ about_cb (GSimpleAction *action,
                                "website-label", _("Devhelp Website"),
                                "logo-icon-name", "org.gnome.Devhelp",
                                "license-type", GTK_LICENSE_GPL_3_0,
-                               "copyright", "Copyright 2001-2019 – the Devhelp team",
+                               "copyright", "Copyright 2001-2020 – the Devhelp team",
                                NULL);
 }