[gimp-web/testing] Add mirror.vutbr.cz mirrors

[Michael Schumacher <schumaml src gnome org>]

commit 69947b38aae73430d68db681f2d94101de172c84
Author: nmat <15926-nmat users noreply gitlab gnome org>
Date:   Mon Jun 10 22:37:52 2019 +0200

    Add mirror.vutbr.cz mirrors
    
    * Fix #50

 content/downloads/mirrors2.json | 5 +++++
 1 file changed, 5 insertions(+)
---
diff --git a/content/downloads/mirrors2.json b/content/downloads/mirrors2.json
index 4a694b85..c9045973 100644
--- a/content/downloads/mirrors2.json
+++ b/content/downloads/mirrors2.json
@@ -53,5 +53,10 @@
       "http://gimp.cp-dev.com/";,
       "ftp://devhost.cp-dev.com/gimp";,
       "rsync://gimp.cp-dev.com/gimp"
+    ],
+    "mirror.vutbr.cz" : [
+      "http://mirror.vutbr.cz/gimp";,
+      "ftp://mirror.vutbr.cz/gimp";,
+      "rsync://mirror.vutbr.cz/gimp"
     ]
 }