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/motors/motor.h b/motors/motor.h
index 3f7b132..20f60fc 100644
--- a/motors/motor.h
+++ b/motors/motor.h
@@ -13,8 +13,7 @@
 #include "motors/print/print.h"
 #include "motors/util.h"
 
-namespace frc971 {
-namespace motors {
+namespace frc971::motors {
 
 class MotorControls {
  public:
@@ -189,7 +188,6 @@
   PrintingImplementation *printing_implementation_ = nullptr;
 };
 
-}  // namespace motors
-}  // namespace frc971
+}  // namespace frc971::motors
 
 #endif  // MOTORS_MOTOR_H_