[gimp-web] downloads: add GIMP 2.99.4

[Michael Schumacher <schumaml src gnome org>]

commit ca7ce5f0cccbbc4dd742df98fd44c15b48e5d57c
Author: Michael Schumacher <schumaml gmx de>
Date:   Wed Dec 23 23:08:35 2020 +0100

    downloads: add GIMP 2.99.4
    
    Added GIMP 2.99.4 source tarball and installer for Microsoft Windows.

 content/gimp_versions.json | 21 +++++++++++++++++++++
 1 file changed, 21 insertions(+)
---
diff --git a/content/gimp_versions.json b/content/gimp_versions.json
index 7a6739a7..bba86311 100644
--- a/content/gimp_versions.json
+++ b/content/gimp_versions.json
@@ -440,6 +440,27 @@
         }
     ],
     "DEVELOPMENT":  [
+        {
+            "version": "2.99.4",
+            "date": "2020-12-24",
+            "source": [
+                {
+                    "filename": "gimp-2.99.4.tar.bz2 ",
+                    "sha512": 
"1abb6851f4c6af440d75d09c55dcb6bf6485739de1960fb536035935729331221265beef589386da685ad8ffbe83e0f0699cf2db55589953deae4d82aa99154b",
+                    "sha256": "df25c149c78f265181809d7685a9470a62c3c2f08c05e8498a4d5c86a048a5b2"
+                }
+            ],
+            "windows": [
+                 {
+                    "date": "2020-12-24",
+                    "filename": "gimp-2.99.4-setup.exe",
+                    "sha512": 
"9d89da8d38786d6d9916acc45109db90364d980788c567308585059cbcf3b8cb05dbe9ce616326e108b77c07f83d1d1d2bcfd9035092235726a8fc74549bf682",
+                    "sha256": "3ecd4e88972e8f4d38f70d73b6236c3433c9ea2a60dfd0c9e2395b83280092ed",
+                    "min-support": "Windows 7",
+                    "build-id": "org.gimp.GIMP_official"
+                }
+            ]
+        },
         {
             "version": "2.99.2",
             "date": "2020-10-25",