[jhbuild] Set gitg branch to gnome-3-18

[Jesse van den Kieboom <jessevdk src gnome org>]

commit af6509568489e739d7d83d7d7fb04962a75b4ef9
Author: Jesse van den Kieboom <jessevdk gnome org>
Date:   Wed Aug 19 22:07:23 2015 +0200

    Set gitg branch to gnome-3-18

 modulesets/gnome-apps-3.18.modules |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/modulesets/gnome-apps-3.18.modules b/modulesets/gnome-apps-3.18.modules
index ec70d6c..8b68045 100644
--- a/modulesets/gnome-apps-3.18.modules
+++ b/modulesets/gnome-apps-3.18.modules
@@ -711,7 +711,7 @@
   </autotools>
 
   <autotools id="gitg">
-    <branch/>
+    <branch revision="gnome-3-18"/>
     <dependencies>
       <dep package="gtk+"/>
       <dep package="glib"/>