libimobiledevice HEAD add libtatsu dependency

As libimobiledevice keeps developing without releasing,
new dependencies are added. This commit the libtatsu
dependency when building from HEAD.

Closes libimobiledevice/libimobiledevice#1217

Author: tux-mind

Formula/lib/libimobiledevice.rb

@@ -22,6 +22,7 @@ class Libimobiledevice < Formula
   head do
     url "https://github.com/libimobiledevice/libimobiledevice.git", branch: "master"
     depends_on "libimobiledevice-glue"
+    depends_on "libtatsu"
   end
 
   depends_on "autoconf" => :build