Update README to reflect default mongo color

README.md

@@ -42,6 +42,7 @@ Itslog.configure do |config|
     config.namespace_colors = {
       'action_controller' => "\e[32m",
       'active_record'     => "\e[94m",
+      'mongo'             => "\e[94m",
       'action_view'       => "\e[36m"
     }
     config.format = "%t [%n]: %m"