[gegl] hue-choma: add reference-hash

[Thomas Manni <tmanni src gnome org>]

commit ba554c54538c2d4209a6c0b758d50c33837c51d7
Author: Thomas Manni <thomas manni free fr>
Date:   Thu Sep 21 11:30:50 2017 +0200

    hue-choma: add reference-hash

 operations/common/hue-chroma.c |   11 ++++++-----
 1 files changed, 6 insertions(+), 5 deletions(-)
---
diff --git a/operations/common/hue-chroma.c b/operations/common/hue-chroma.c
index 2e06cae..b0e87f1 100644
--- a/operations/common/hue-chroma.c
+++ b/operations/common/hue-chroma.c
@@ -106,11 +106,12 @@ gegl_op_class_init (GeglOpClass *klass)
   point_filter_class->process = process;
 
   gegl_operation_class_set_keys (operation_class,
-      "name",       "gegl:hue-chroma",
-      "title",      _("Hue-Chroma"),
-      "categories", "color",
-      "cl-source",   hue_chroma_cl_source,
-      "description", _("Adjust LCH Hue, Chroma, and Lightness"),
+      "name",           "gegl:hue-chroma",
+      "title",          _("Hue-Chroma"),
+      "categories",     "color",
+      "reference-hash", "9bbe341d798da4f7b181c903e6f442fd",
+      "cl-source",      hue_chroma_cl_source,
+      "description",    _("Adjust LCH Hue, Chroma, and Lightness"),
       NULL);
 }