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_test.cc b/frc971/wpilib/wpilib_utils_test.cc
index 2b21438..e9781b9 100644
--- a/frc971/wpilib/wpilib_utils_test.cc
+++ b/frc971/wpilib/wpilib_utils_test.cc
@@ -4,9 +4,7 @@
 #include "aos/testing/test_logging.h"
 #include "frc971/constants.h"
 
-namespace frc971 {
-namespace wpilib {
-namespace testing {
+namespace frc971::wpilib::testing {
 namespace {
 
 double climber_pot_translate_inverse_test(double position) {
@@ -153,6 +151,4 @@
 }
 
 }  // namespace
-}  // namespace testing
-}  // namespace wpilib
-}  // namespace frc971
\ No newline at end of file
+}  // namespace frc971::wpilib::testing