Changes to Create a SKU

added the new required request property data/relationships/shipping_category/data

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

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

removed the request property data/relationships/shipping_category/id

removed the request property data/relationships/shipping_category/type

added the new optional request property data/relationships/tags

the type request property default value skus was removed

added the new gr enum value to the request property data/attributes/unit_of_weight

added the new lb enum value to the request property data/attributes/unit_of_weight

added the new oz enum value to the request property data/attributes/unit_of_weight

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

added the media type application/vnd.api+json for the response with the status 201