Nest all namespaces

The compiler supports this now.  We can type less going forward.
No functional changes.

Signed-off-by: Stephan Pleines <pleines.stephan@gmail.com>
Change-Id: I29d6fa4f9aacc0e381f1a7637294db0392466995
diff --git a/frc971/wpilib/wpilib_utils.cc b/frc971/wpilib/wpilib_utils.cc
index 937acd9..d6bc696 100644
--- a/frc971/wpilib/wpilib_utils.cc
+++ b/frc971/wpilib/wpilib_utils.cc
@@ -1,7 +1,6 @@
 #include "frc971/wpilib/wpilib_utils.h"
 
-namespace frc971 {
-namespace wpilib {
+namespace frc971::wpilib {
 
 bool SafePotVoltageRange(::frc971::constants::Range subsystem_range,
                          double potentiometer_offset,
@@ -22,5 +21,4 @@
           (kMinVoltage + limit_buffer) < max_range_voltage &&
           max_range_voltage < (kMaxVoltage - limit_buffer));
 }
-}  // namespace wpilib
-}  // namespace frc971
\ No newline at end of file
+}  // namespace frc971::wpilib