MySQL: INSERT ... ON DUPLICATE KEY UPDATE

Is there a plan for supporting `INSERT INTO ... ON DUPLICATE KEY UPDATE` variaton of `INSERT` for MySQL? I'd attempt to work it out and send a pull request if there's any interest.
This was supposed to be equivalent of `col` method from, code is almost the same as https://github.com/auraphp/Aura.SqlQuery/blob/develop-2/src/Common/Insert.php#L131 - thus I've left the same phpdoc as well (it's using `func_get_args`)