Fix to_prepare warning

Author: kirs

lib/active_model/serializer/railtie.rb

@@ -12,6 +12,10 @@ class Railtie < Rails::Railtie
         include app.routes.url_helpers
       end
     end
+
+    config.to_prepare do
+      ActiveModel::Serializer.serializers_cache.clear
+    end
   end
 end
 

lib/active_model_serializers.rb

@@ -14,9 +14,6 @@
       ActionController::Base.send(:include, ::ActionController::Serialization)
       ActionController::TestCase.send(:include, ::ActionController::SerializationAssertions)
     end
-    ActionDispatch::Reloader.to_prepare do
-      ActiveModel::Serializer.serializers_cache.clear
-    end
   end
 rescue LoadError
   # rails not installed, continuing