[gnome-builder/gnome-builder-3-28] Update POTFILES.in

[Piotr Drąg <piotrdrag src gnome org>]

commit 1300c8ef8b9c47ca64fc12024a372c6da474498e
Author: Piotr Drąg <piotrdrag gmail com>
Date:   Wed Mar 28 18:12:59 2018 +0200

    Update POTFILES.in

 po/POTFILES.in | 1 +
 1 file changed, 1 insertion(+)
---
diff --git a/po/POTFILES.in b/po/POTFILES.in
index a60106bb0..a432a9ccf 100644
--- a/po/POTFILES.in
+++ b/po/POTFILES.in
@@ -217,6 +217,7 @@ src/plugins/spellcheck/gbp-spell-widget.ui
 src/plugins/spellcheck/gtk/menus.ui
 src/plugins/support/gtk/menus.ui
 src/plugins/support/ide-support-application-addin.c
+src/plugins/symbol-tree/gbp-symbol-layout-stack-addin.c
 src/plugins/symbol-tree/gbp-symbol-menu-button.c
 src/plugins/symbol-tree/gbp-symbol-menu-button.ui
 src/plugins/sysmon/gb-sysmon-panel.ui