Add postcode page to the property information subsection

app/models/form/sales/subsections/property_information.rb

@@ -11,6 +11,7 @@ class Form::Sales::Subsections::PropertyInformation < ::Form::Subsection
       Form::Sales::Pages::PropertyNumberOfBedrooms.new(nil, nil, self),
       Form::Sales::Pages::PropertyUnitType.new(nil, nil, self),
       Form::Sales::Pages::PropertyBuildingType.new(nil, nil, self),
+      Form::Sales::Pages::Postcode.new(nil, nil, self),
       Form::Sales::Pages::PropertyLocalAuthority.new(nil, nil, self),
       Form::Sales::Pages::PropertyWheelchairAccessible.new(nil, nil, self),
     ]

spec/models/form/sales/subsections/property_information_spec.rb

@@ -17,6 +17,7 @@ RSpec.describe Form::Sales::Subsections::PropertyInformation, type: :model do
         property_number_of_bedrooms
         property_unit_type
         property_building_type
+        property_postcode
         property_local_authority
         property_wheelchair_accessible
       ],