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/aos/events/logging/log_writer.h b/aos/events/logging/log_writer.h
index ec02b7d..eb69d7e 100644
--- a/aos/events/logging/log_writer.h
+++ b/aos/events/logging/log_writer.h
@@ -17,8 +17,7 @@
 #include "aos/time/time.h"
 #include "aos/uuid.h"
 
-namespace aos {
-namespace logger {
+namespace aos::logger {
 
 // Packs the provided configuration into the separate config LogFileHeader
 // container.
@@ -377,7 +376,6 @@
   std::chrono::nanoseconds logging_delay_ = std::chrono::nanoseconds(0);
 };
 
-}  // namespace logger
-}  // namespace aos
+}  // namespace aos::logger
 
 #endif  // AOS_EVENTS_LOGGING_LOG_WRITER_H_