[gnome-builder] flatpak: bump libgit2 maintenance branch

[Christian Hergert <chergert src gnome org>]

commit be5655ad77f38eab38d9d3b1b9a83fbef680a9ff
Author: Christian Hergert <chergert redhat com>
Date:   Mon Sep 11 15:32:27 2017 -0700

    flatpak: bump libgit2 maintenance branch

 org.gnome.Builder.json |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/org.gnome.Builder.json b/org.gnome.Builder.json
index 7d993f4..82fcee0 100644
--- a/org.gnome.Builder.json
+++ b/org.gnome.Builder.json
@@ -493,7 +493,7 @@
                 {
                     "type": "git",
                     "url": "https://github.com/libgit2/libgit2.git";,
-                    "branch": "maint/v0.25"
+                    "branch": "maint/v0.26"
                 }
             ]
         },