Changes to Criar cupom

the request property active became required

the request property code became required

the request property discount_type became required

the request property end_at became required

the request property min_value became required

the request property quantity became required

the request property start_at became required

the request property value became required

added the new optional request property advertise

added the new optional request property freebie_id

added the optional property advertise to the response with the 201 status

added the optional property freebie_id to the response with the 201 status