[gegl] noise-perlin: add reference hash

[Øyvind Kolås <ok src gnome org>]

commit 7cbd5b1ea6a35d5e835c5347dda01a1b576ecd25
Author: Øyvind Kolås <pippin gimp org>
Date:   Sat Mar 11 20:40:36 2017 +0100

    noise-perlin: add reference hash

 operations/common/noise-perlin.c |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)
---
diff --git a/operations/common/noise-perlin.c b/operations/common/noise-perlin.c
index 749cad5..885cb99 100644
--- a/operations/common/noise-perlin.c
+++ b/operations/common/noise-perlin.c
@@ -110,6 +110,7 @@ gegl_op_class_init (GeglOpClass *klass)
     "name",               "gegl:perlin-noise",
     "title",              _("Perlin Noise"),
     "categories",         "render",
+    "reference-hash",     "78a43934ae5b69e48ed523a61bdea6c4",
     "position-dependent", "true",
     "description", _("Perlin noise generator"),
     NULL);