Rename facebook::sonar namespace

Summary: Pull Request resolved: https://github.com/facebook/flipper/pull/271

Reviewed By: passy

Differential Revision: D9861393

Pulled By: jknoxville

fbshipit-source-id: d65f751c35028748915023f33f273d6ec45863c8

xplat/Sonar/Log.h

@@ -3,9 +3,9 @@
 #include <string>
 
 namespace facebook {
-namespace sonar {
+namespace flipper {
 
   void log(const std::string& message);
 
-} // namespace sonar
+} // namespace flipper
 } // namespace facebook