[gimp] Add url to code so that Source button actually does what it is supposed to do.

[Jehan <jehanp src gnome org>]

commit a9a61d963d647fd74712f5b79c51390a792f73d0
Author: PhotonQyv <shenstone porter gmail com>
Date:   Thu Jun 4 21:08:14 2020 +0000

    Add url to code so that Source button actually does what it is supposed to do.

 plug-ins/goat-exercises/goat-exercise-py3.py | 1 +
 1 file changed, 1 insertion(+)
---
diff --git a/plug-ins/goat-exercises/goat-exercise-py3.py b/plug-ins/goat-exercises/goat-exercise-py3.py
index 8f0d4a19ff..f73a115853 100755
--- a/plug-ins/goat-exercises/goat-exercise-py3.py
+++ b/plug-ins/goat-exercises/goat-exercise-py3.py
@@ -122,6 +122,7 @@ class Goat (Gimp.PlugIn):
                     dialog.destroy()
                     break
                 elif response == Gtk.ResponseType.APPLY:
+                    url = 
"https://gitlab.gnome.org/GNOME/gimp/-/blob/master/plug-ins/goat-exercises/goat-exercise-py3.py";
                     Gio.app_info_launch_default_for_uri(url, None)
                     continue
                 else: