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/motors/algorithms.h b/motors/algorithms.h
index 20dcbe8..95fa772 100644
--- a/motors/algorithms.h
+++ b/motors/algorithms.h
@@ -5,8 +5,7 @@
 
 #include <array>
 
-namespace frc971 {
-namespace motors {
+namespace frc971::motors {
 
 struct ReadingsToBalance {
   // Adds a single reading at index.
@@ -57,7 +56,6 @@
   return r;
 }
 
-}  // namespace motors
-}  // namespace frc971
+}  // namespace frc971::motors
 
 #endif  // MOTORS_ALGORITHMS_H_