[gegl] gradient-map: add reference hash

[Øyvind Kolås <ok src gnome org>]

commit 2372e131046d8818e9adf56021454c6ddda217f7
Author: Øyvind Kolås <pippin gimp org>
Date:   Sat Oct 14 03:17:32 2017 +0200

    gradient-map: add reference hash

 operations/workshop/gradient-map.c |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)
---
diff --git a/operations/workshop/gradient-map.c b/operations/workshop/gradient-map.c
index efba4c6..1c20f41 100644
--- a/operations/workshop/gradient-map.c
+++ b/operations/workshop/gradient-map.c
@@ -244,6 +244,7 @@ gegl_op_class_init (GeglOpClass *klass)
       "name",       "gegl:gradient-map",
       "title"      , _("Gradient Map"),
       "categories", "color",
+      "reference-hash", "669ccb10db850cbb7cc1647d94f03224",
       "description", _("Applies a color gradient."),
       "reference-composition", composition,
       NULL);