Merge pull request reidmorrison#155 from jcmfernandes/patch-1

Avoid warning when attempting to add a second console appender

Author: reidmorrison

lib/rails_semantic_logger/extensions/rails/server.rb

@@ -9,7 +9,7 @@ class Server
     def log_to_stdout
       wrapped_app # touch the app so the logger is set up
 
-      SemanticLogger.add_appender(io: $stdout, formatter: :color)
+      SemanticLogger.add_appender(io: $stdout, formatter: :color) unless SemanticLogger.appenders.console_output?
     end
   end
 end