Add closed loop option to drivetrain config.

Change-Id: Icff6a814f6a75843bbb0d441d12cc33b5387b843
diff --git a/y2016/control_loops/drivetrain/drivetrain_base.cc b/y2016/control_loops/drivetrain/drivetrain_base.cc
index 0065199..95b8907 100644
--- a/y2016/control_loops/drivetrain/drivetrain_base.cc
+++ b/y2016/control_loops/drivetrain/drivetrain_base.cc
@@ -20,6 +20,7 @@
 const DrivetrainConfig &GetDrivetrainConfig() {
   static DrivetrainConfig kDrivetrainConfig{
       ::frc971::control_loops::drivetrain::ShifterType::HALL_EFFECT_SHIFTER,
+      ::frc971::control_loops::drivetrain::LoopType::CLOSED_LOOP,
 
       ::y2016::control_loops::drivetrain::MakeDrivetrainLoop,
       ::y2016::control_loops::drivetrain::MakeVelocityDrivetrainLoop,