[gitg] Add vala dependency

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

commit cc5f945e7988bd4fa75af241989642132709fa0b
Author: Jesse van den Kieboom <jessevdk gnome org>
Date:   Wed Dec 30 13:07:23 2015 +0100

    Add vala dependency

 osx/Taps/gitg/gitg.rb |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)
---
diff --git a/osx/Taps/gitg/gitg.rb b/osx/Taps/gitg/gitg.rb
index eb96b4a..f6030a9 100644
--- a/osx/Taps/gitg/gitg.rb
+++ b/osx/Taps/gitg/gitg.rb
@@ -8,6 +8,7 @@ class Gitg < Formula
   depends_on "pkg-config" => :build
   depends_on "intltool" => :build
   depends_on "libtool" => :build
+  depends_on "vala" => :build
   depends_on "gettext"
   depends_on "glib"
   depends_on "shared-mime-info"