[gimp-web/testing] Add pirbot.com mirror

[Alexandre Prokoudine <aprokoudine src gnome org>]

commit 126a145fd53d8d2656fd42c9dfd3cb5876fea721
Author: Alexandre Prokoudine <alexandre prokoudine gmail com>
Date:   Tue Aug 30 01:46:28 2016 +0300

    Add pirbot.com mirror

 content/downloads/mirrors2.json |    3 +++
 1 files changed, 3 insertions(+), 0 deletions(-)
---
diff --git a/content/downloads/mirrors2.json b/content/downloads/mirrors2.json
index ac35926..c3832e3 100644
--- a/content/downloads/mirrors2.json
+++ b/content/downloads/mirrors2.json
@@ -50,5 +50,8 @@
     "acc.umu.se" : [
       "http://ftp.acc.umu.se/pub/gimp/";,
       "ftp://ftp.acc.umu.se/pub/gimp/";
+    ],
+    "pirbot.com" : [
+      "http://pirbot.com/mirrors/gimp/";
     ]
 }