refactor logger to not use hierarchical namespaced structure

lib/grape/middleware/logger.rb

@@ -3,10 +3,7 @@ require 'grape'
 
 # avoid superclass mismatch when version file gets loaded first
 Grape::Middleware.send :remove_const, :Logger if defined? Grape::Middleware::Logger
-module Grape
-  module Middleware
-    class Logger < Grape::Middleware::Globals
-
+class Grape::Middleware::Logger < Grape::Middleware::Globals
   def before
     start_time
     super # sets env['grape.*']
@@ -73,9 +70,7 @@ module Grape
   end
 
   def logger
-        @logger ||= @options[:logger] || ::Logger.new(STDOUT)
-      end
-    end
+    @logger ||= @options[:logger] || Logger.new(STDOUT)
   end
 end