Change pastable arg name

lib/acts_as_pasting/pastable.rb

@@ -33,7 +33,7 @@ module ActsAsPasting
 
     module ClassMethods
       def acts_as_pastable associations, prefix: '', **options
-        pasting_name = prefix.blank? ? :pastings : [prefix, 'pastings'].join('_').to_sym
+        pasting_name = prefix.blank? ? :pastable_pastings : [prefix, 'pastable_pastings'].join('_').to_sym
         has_many pasting_name, as: :pasteable, class_name: 'ActsAsPasting::Pasting'
         has_many associations, through: pasting_name, source: :pasted, **options
       end