Remove unused sequential id from shipments

lib/planet_express_express/shipment_reader.rb

@@ -2,7 +2,6 @@ module PlanetExpressExpress
   require "date"
   class ShipmentReader
     Shipment = Struct.new(
-      :id,
       :date,
       :size,
       :provider,
@@ -57,7 +56,6 @@ module PlanetExpressExpress
       parts = line.split(" ")
 
       shipment = Shipment.new(
-        id: sequential_id,
         date: Date.strptime(parts[0], "%Y-%m-%d"),
         size: parts[1]&.to_sym,
         provider: parts[2]&.to_sym,
@@ -73,9 +71,5 @@ module PlanetExpressExpress
 
       shipment
     end
-
-    def sequential_id
-      @id += 1
-    end
   end
 end