Changes to Update a SKU list

request property data/type was restricted to a list of enum values

added the new optional request property data/relationships/customer

the request property data/attributes/description became nullable

the request property data/attributes/image_url became nullable

the request property data/attributes/metadata became nullable

the request property data/attributes/reference became nullable

the request property data/attributes/reference_origin became nullable

the request property data/attributes/sku_code_regex became nullable

the type request property default value sku_lists was removed

added the new sku_lists enum value to the request property data/type

added the media type application/vnd.api+json for the response with the status 200