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/y2022/vision/camera_reader.h b/y2022/vision/camera_reader.h
index 8782886..54fcb30 100644
--- a/y2022/vision/camera_reader.h
+++ b/y2022/vision/camera_reader.h
@@ -20,8 +20,7 @@
 #include "y2022/vision/target_estimate_generated.h"
 #include "y2022/vision/target_estimator.h"
 
-namespace y2022 {
-namespace vision {
+namespace y2022::vision {
 
 using namespace frc971::vision;
 using frc971::controls::LedOutput;
@@ -163,6 +162,5 @@
   GPIOControl gpio_disable_control_;
 };
 
-}  // namespace vision
-}  // namespace y2022
+}  // namespace y2022::vision
 #endif  // Y2022_VISION_CAMERA_READER_H_