[jhbuild] 3.20: Use the gtk-3-20 branch for GTK+

[Matthias Clasen <matthiasc src gnome org>]

commit cc401f75abfa5b5d08afa26139f0ce77bd52c647
Author: Matthias Clasen <mclasen redhat com>
Date:   Fri Mar 25 11:55:43 2016 -0400

    3.20: Use the gtk-3-20 branch for GTK+

 modulesets/gnome-suites-core-deps-3.20.modules |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/modulesets/gnome-suites-core-deps-3.20.modules b/modulesets/gnome-suites-core-deps-3.20.modules
index fb2a0a7..3e4639e 100644
--- a/modulesets/gnome-suites-core-deps-3.20.modules
+++ b/modulesets/gnome-suites-core-deps-3.20.modules
@@ -620,7 +620,7 @@
     <if condition-set="quartz">
       <autogenargs value="--enable-quartz-backend"/>
     </if>
-    <branch/>
+    <branch revision="gtk-3-20"/>
     <dependencies>
       <dep package="atk"/>
       <dep package="glib"/>