[geary] Update POTFILES.skip

[Piotr Drąg <piotrdrag src gnome org>]

commit f57c8d2e638e4b68d77623018bae72e2c6dd914f
Author: Piotr Drąg <piotrdrag gmail com>
Date:   Sat Apr 27 17:52:33 2019 +0200

    Update POTFILES.skip

 po/POTFILES.skip | 1 +
 1 file changed, 1 insertion(+)
---
diff --git a/po/POTFILES.skip b/po/POTFILES.skip
index 1a319ae9..12759016 100644
--- a/po/POTFILES.skip
+++ b/po/POTFILES.skip
@@ -1,3 +1,4 @@
 # List of source files that should *not* be translated.
 # Please keep this file sorted alphabetically.
 build
+subprojects/libhandy