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/y2019/joystick_angle.h b/y2019/joystick_angle.h
index dfd8bb9..2dad968 100644
--- a/y2019/joystick_angle.h
+++ b/y2019/joystick_angle.h
@@ -6,9 +6,7 @@
 using ::frc971::input::driver_station::Data;
 using ::frc971::input::driver_station::JoystickAxis;
 
-namespace y2019 {
-namespace input {
-namespace joysticks {
+namespace y2019::input::joysticks {
 bool AngleCloseTo(double angle, double near, double range);
 
 enum class JoystickAngle {
@@ -25,8 +23,6 @@
                                   const JoystickAxis &y_axis, const Data &data);
 JoystickAngle GetJoystickPosition(float x_axis, float y_axis);
 
-}  // namespace joysticks
-}  // namespace input
-}  // namespace y2019
+}  // namespace y2019::input::joysticks
 
 #endif  // Y2019_JOYSTICK_ANGLE_H_