[gnome-builder] Update POTFILES.in

[Piotr Drąg <piotrdrag src gnome org>]

commit 7be8378dbcda001f1aa699eb3bc6369e7ca87bc0
Author: Piotr Drąg <piotrdrag gmail com>
Date:   Sat Jan 18 15:56:50 2020 +0100

    Update POTFILES.in

 po/POTFILES.in | 1 +
 1 file changed, 1 insertion(+)
---
diff --git a/po/POTFILES.in b/po/POTFILES.in
index d49aa84dd..19e9aaabe 100644
--- a/po/POTFILES.in
+++ b/po/POTFILES.in
@@ -188,6 +188,7 @@ src/plugins/color-picker/gtk/menus.ui
 src/plugins/command-bar/gbp-command-bar-shortcuts.c
 src/plugins/comment-code/gbp-comment-code-editor-page-addin.c
 src/plugins/comment-code/gtk/menus.ui
+src/plugins/copyright/copyright_plugin.py
 src/plugins/create-project/gbp-create-project-application-addin.c
 src/plugins/create-project/gbp-create-project-surface.c
 src/plugins/create-project/gbp-create-project-surface.ui