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/frc971/wpilib/wpilib_interface.h b/frc971/wpilib/wpilib_interface.h
index b992aa3..1d64d2c 100644
--- a/frc971/wpilib/wpilib_interface.h
+++ b/frc971/wpilib/wpilib_interface.h
@@ -6,14 +6,12 @@
 #include "aos/events/event_loop.h"
 #include "frc971/input/robot_state_generated.h"
 
-namespace frc971 {
-namespace wpilib {
+namespace frc971::wpilib {
 
 // Sends out a message on ::aos::robot_state.
 flatbuffers::Offset<aos::RobotState> PopulateRobotState(
     aos::Sender<::aos::RobotState>::Builder *builder, int32_t my_pid);
 
-}  // namespace wpilib
-}  // namespace frc971
+}  // namespace frc971::wpilib
 
 #endif  // FRC971_WPILIB_WPILIB_INTERFACE_H_