Turned down hood so it can't break it's self.

Change-Id: I697c457a20d0ace87f3e53a14798ab8ba5d57c5a
diff --git a/y2017/control_loops/superstructure/hood/hood.h b/y2017/control_loops/superstructure/hood/hood.h
index f5daa42..41cbbd0 100644
--- a/y2017/control_loops/superstructure/hood/hood.h
+++ b/y2017/control_loops/superstructure/hood/hood.h
@@ -32,7 +32,7 @@
 
   // The zeroing and operating voltages.
   static constexpr double kZeroingVoltage = 2.0;
-  static constexpr double kOperatingVoltage = 12.0;
+  static constexpr double kOperatingVoltage = 4.0;
 
   void Iterate(const control_loops::HoodGoal *unsafe_goal,
                const ::frc971::IndexPosition *position, double *output,