[gegl] spiral: add reference hash

[Øyvind Kolås <ok src gnome org>]

commit 6bfe02ba14837ba9b9e19b97ddf2f96cb2e6531b
Author: Øyvind Kolås <pippin gimp org>
Date:   Sat Nov 11 21:53:00 2017 +0100

    spiral: add reference hash

 operations/common-gpl3+/spiral.c |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)
---
diff --git a/operations/common-gpl3+/spiral.c b/operations/common-gpl3+/spiral.c
index 7e26a64..9a4d4ec 100644
--- a/operations/common-gpl3+/spiral.c
+++ b/operations/common-gpl3+/spiral.c
@@ -443,6 +443,7 @@ gegl_op_class_init (GeglOpClass *klass)
     "categories",         "render",
     "position-dependent", "true",
     "license",            "GPL3+",
+    "reference-hash",     "1884feadc5b8456c8d02ab10efc2de80",
     "description",        _("Spiral renderer"),
     NULL);
 }