[gnome-chess] Update POTFILES.in

[Piotr Drąg <piotrdrag src gnome org>]

commit 836d3003eac6a16ce122d97ebce91b1fef737c36
Author: Piotr Drąg <piotrdrag gmail com>
Date:   Sun Dec 9 12:09:57 2018 +0100

    Update POTFILES.in

 po/POTFILES.in | 1 +
 1 file changed, 1 insertion(+)
---
diff --git a/po/POTFILES.in b/po/POTFILES.in
index fd7b2da..2464856 100644
--- a/po/POTFILES.in
+++ b/po/POTFILES.in
@@ -3,6 +3,7 @@
 data/gnome-chess.appdata.xml.in
 data/gnome-chess.desktop.in
 data/gnome-chess.ui
+data/help-overlay.ui
 data/org.gnome.chess.gschema.xml
 data/preferences.ui
 data/promotion-type-selector.ui