[gimp-web/testing] Add 2.8.20 DMG package.

[Michael Schumacher <schumaml src gnome org>]

commit 992dc95966168dc6194e1291547b4f8fffe22b97
Author: Michael Schumacher <schumaml gmx de>
Date:   Sun Feb 5 22:01:23 2017 +0100

    Add 2.8.20 DMG package.

 GIMP_VERSIONS |    3 +++
 1 files changed, 3 insertions(+), 0 deletions(-)
---
diff --git a/GIMP_VERSIONS b/GIMP_VERSIONS
index eb4945b..3d44d82 100644
--- a/GIMP_VERSIONS
+++ b/GIMP_VERSIONS
@@ -4,6 +4,9 @@
        "2.8.20": {
             "source": { 
                 "gimp-2.8.20.tar.bz2": "d405640c426b234d6efc36fb4f5bae57"
+                },
+            "macos": {
+               "gimp-2.8.20-x86_64.dmg": "ba69e3b399c6903180265d60ed2c49b2"
                 }
            },