def count
      values = read_file
      values.each do |key, value|
        value["checked"] = Time.now
        value["total"] = ask("#{key.titlecase}:").to_i
      end
      write_file(values)
      invoke :check
    end
def count
      values = read_file
      values.each do |key, value|
        value["checked"] = Time.now
        value["total"] = ask("#{key.titlecase}:").to_i
      end
      write_file(values)
      invoke :check
    end
Do a count update for all inventory items *interactively*.
 Stocker#count will loop through the inventory and ask you for the total on hand count for each item.
 When the counting is finished, Stocker will run Stocker#check and open the URLs of any low stock items.