[gnome-nibbles] Update POTFILES.in

[Piotr Drąg <piotrdrag src gnome org>]

commit 56540434d00b1fe547dfec2425367d0a1aef694a
Author: Piotr Drąg <piotrdrag gmail com>
Date:   Thu Jul 9 16:59:58 2020 +0200

    Update POTFILES.in

 po/POTFILES.in | 1 +
 1 file changed, 1 insertion(+)
---
diff --git a/po/POTFILES.in b/po/POTFILES.in
index 57437ab..6f95017 100644
--- a/po/POTFILES.in
+++ b/po/POTFILES.in
@@ -6,6 +6,7 @@ data/org.gnome.Nibbles.gschema.xml
 data/ui/controls.ui
 data/ui/controls-grid.ui
 data/ui/first-run.ui
+data/ui/help-overlay.ui
 data/ui/nibbles.ui
 data/ui/players.ui
 data/ui/player-score-box.ui