using module name of Loggers rather than Logger

also explicit to_s on response body

lib/grape_logging/loggers/base.rb

@@ -1,5 +1,5 @@
 module GrapeLogging
-  module Logger
+  module Loggers
     class Base
       def before
       end

lib/grape_logging/loggers/database_time.rb

@@ -1,6 +1,6 @@
 module GrapeLogging
-  module Logger
-    class DatabaseTime < GrapeLogging::Logger::Base
+  module Loggers
+    class DatabaseTime < GrapeLogging::Loggers::Base
       def before
         @duration = 0
         ActiveSupport::Notifications.subscribe('sql.active_record') do |*args|

lib/grape_logging/loggers/filter_parameters.rb

@@ -1,6 +1,6 @@
 module GrapeLogging
-  module Logger
-    class FilterParameters < GrapeLogging::Logger::Base
+  module Loggers
+    class FilterParameters < GrapeLogging::Loggers::Base
       def initialize(filter_parameters = nil, replacement = '[FILTERED]')
         @filter_parameters = filter_parameters || (defined?(Rails.application) ? Rails.application.config.filter_parameters : [])
         @replacement = replacement

lib/grape_logging/loggers/response.rb

@@ -1,9 +1,9 @@
 module GrapeLogging
-  module Logger
-    class Response < GrapeLogging::Logger::Base
+  module Loggers
+    class Response < GrapeLogging::Loggers::Base
       def parameters(request, response)
         {
-          response: response.body
+          response: response.body.to_s
         }
       end
     end