Make options param optional

Author: RobinDaugherty

lib/active_model/array_serializer.rb

@@ -38,7 +38,7 @@ def serializer_for(item)
       serializer_class.new(item, scope: scope, key_format: key_format, only: @only, except: @except, polymorphic: @polymorphic, namespace: @namespace)
     end
 
-    def serializable_object(options)
+    def serializable_object(options={})
       @object.map do |item|
         serializer_for(item).serializable_object_with_notification(options)
       end

lib/active_model/serializable.rb

@@ -18,7 +18,7 @@ def as_json(options={})
       end
     end
 
-    def serializable_object_with_notification(options)
+    def serializable_object_with_notification(options={})
       instrument('!serialize') do
         serializable_object(options)
       end