Nest some more namespaces

Did someone previously suggest that all namespace had been
nested?  Silly.

Signed-off-by: Stephan Pleines <pleines.stephan@gmail.com>
Change-Id: I22278c1caaeba8b47dc46fb2ed3078c20a11e190
diff --git a/y2016/constants.h b/y2016/constants.h
index f332e37..c3bf681 100644
--- a/y2016/constants.h
+++ b/y2016/constants.h
@@ -7,8 +7,7 @@
 #include "frc971/control_loops/state_feedback_loop.h"
 #include "frc971/shifter_hall_effect.h"
 
-namespace y2016 {
-namespace constants {
+namespace y2016::constants {
 
 using ::frc971::constants::PotAndIndexPulseZeroingConstants;
 using ::frc971::constants::ShifterHallEffect;
@@ -111,7 +110,6 @@
 // them.
 const Values &GetValuesForTeam(uint16_t team_number);
 
-}  // namespace constants
-}  // namespace y2016
+}  // namespace y2016::constants
 
 #endif  // Y2016_CONSTANTS_H_