Upgraded y2016 shooter to std::chrono

Change-Id: I095ddfb76e9ee076854b6c70d754d210935e5457
diff --git a/y2016/control_loops/shooter/shooter.h b/y2016/control_loops/shooter/shooter.h
index 0b515f1..aafc472 100644
--- a/y2016/control_loops/shooter/shooter.h
+++ b/y2016/control_loops/shooter/shooter.h
@@ -85,7 +85,7 @@
 
   // Current state.
   ShooterLatchState state_ = ShooterLatchState::PASS_THROUGH;
-  ::aos::time::Time last_pre_shot_timeout_;
+  ::aos::monotonic_clock::time_point last_pre_shot_timeout_;
 
   DISALLOW_COPY_AND_ASSIGN(Shooter);
 };