[gimp-web/testing] Add a min-support to the macOS version.

[Jehan <jehanp src gnome org>]

commit 3a1867af510dc51a361f2bb03e994da54c65a241
Author: Jehan <jehan girinstud io>
Date:   Sun Jul 8 11:23:53 2018 +0200

    Add a min-support to the macOS version.
    
    As noted in `devel-docs/os-support.txt` on gimp-2-10 branch, our macOS
    support is from version 10.10, which is OSX Yosemite.
    This had been discussed and bumped recently on IRC.

 GIMP_VERSIONS | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)
---
diff --git a/GIMP_VERSIONS b/GIMP_VERSIONS
index 8c8456e7..9ef0db7c 100644
--- a/GIMP_VERSIONS
+++ b/GIMP_VERSIONS
@@ -24,7 +24,8 @@
             "macos": {
                 "gimp-2.10.4-x86_64.dmg": {
                         "sha512": 
"40a41c9c006020229e733d9de9fad48d2d1a5c082ab59805f4f5f87f2bc1a128f695792579a095957c1a1f944ca7ef7b029ff5d4f6da84f37afa550f3a9a92e3",
-                        "sha256": "f7b73608b9f476f168962d34f8de09b6f3bb80c98f03159cdd98145f54f9696b"
+                        "sha256": "f7b73608b9f476f168962d34f8de09b6f3bb80c98f03159cdd98145f54f9696b",
+                        "min-support": "OS X Yosemite"
                 }
             }
         },