adds the simple object dependency

where the next object is dependent on the previous one
and just behind it, the padded_length away

lib/risc/position/position.rb

@@ -105,5 +105,6 @@ module Risc
   end
 end
 require_relative "object_position"
+require_relative "object_listener"
 require_relative "instruction_position"
 require_relative "code_position"