Remove other_resource_params

lib/shotengai/controllers/base.rb

@@ -120,7 +120,7 @@ module Shotengai
         
         # If you want to add custome columns, you can do just like:
         #   def resource_params
-        #     super.merge params.require(:some_key)
+        #     super&.merge params.require(:some_key)
         #   end
         def resource_params
           params.require(resource_key).permit!

lib/shotengai/controllers/merchant/product_series_controller.rb

@@ -23,8 +23,6 @@ module Shotengai
               :original_price, :price, :stock
             ).merge(
               { spec: spec, meta: meta }
-            ).merge(
-              other_resource_params
             )
           end
       end