[gnome-builder] Update POTFILES.in

[Piotr Drąg <piotrdrag src gnome org>]

commit d98d9b9d9651e34adeab62d08beaccfdb395d9e0
Author: Piotr Drąg <piotrdrag gmail com>
Date:   Wed Nov 15 16:35:00 2017 +0100

    Update POTFILES.in

 po/POTFILES.in |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)
---
diff --git a/po/POTFILES.in b/po/POTFILES.in
index 622fa22..e684ccf 100644
--- a/po/POTFILES.in
+++ b/po/POTFILES.in
@@ -150,6 +150,7 @@ src/plugins/eslint/eslint_plugin.py
 src/plugins/eslint/org.gnome.builder.plugins.eslint.gschema.xml
 src/plugins/find-other-file/find_other_file.py
 src/plugins/flatpak/gbp-flatpak-clone-widget.ui
+src/plugins/flatpak/gbp-flatpak-download-stage.c
 src/plugins/flatpak/gbp-flatpak-genesis-addin.c
 src/plugins/flatpak/gbp-flatpak-pipeline-addin.c
 src/plugins/flatpak/gbp-flatpak-preferences-addin.c