[gnome-usage] Update POTFILES.skip

[Piotr Drąg <piotrdrag src gnome org>]

commit a510fb82031ab009160c863972838b838cd05d03
Author: Piotr Drąg <piotrdrag gmail com>
Date:   Sat Jun 27 11:55:59 2020 +0200

    Update POTFILES.skip

 po/POTFILES.skip | 1 +
 1 file changed, 1 insertion(+)
---
diff --git a/po/POTFILES.skip b/po/POTFILES.skip
index cc70df6..8e1fa7b 100644
--- a/po/POTFILES.skip
+++ b/po/POTFILES.skip
@@ -11,3 +11,4 @@ src/storage/storage-row-popover.c
 src/storage/storage-view.c
 src/utils.c
 src/window.c
+subprojects/libhandy