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/jevois/cobs.h b/y2019/jevois/cobs.h
index c429622..271a41f 100644
--- a/y2019/jevois/cobs.h
+++ b/y2019/jevois/cobs.h
@@ -11,8 +11,7 @@
 // Stuffing data. <http://www.stuartcheshire.org/papers/cobsforton.pdf> has
 // details on what this entails and why it's a good idea.
 
-namespace frc971 {
-namespace jevois {
+namespace frc971::jevois {
 
 constexpr size_t CobsMaxEncodedSize(size_t decoded_size) {
   return decoded_size + ((decoded_size + 253) / 254);
@@ -213,7 +212,6 @@
   }
 }
 
-}  // namespace jevois
-}  // namespace frc971
+}  // namespace frc971::jevois
 
 #endif  // Y2019_JEVOIS_COBS_H_