headers -> Array
この行のヘッダのリストを返します。
例 require "csv" row = CSV::Row.new(["header1", "header2"], [1, 2]) row.headers # => ["header1", "header2"]
require "csv" row = CSV::Row.new(["header1", "header2"], [1, 2]) row.headers # => ["header1", "header2"]