Updated about.phpversions

Goodbye PHP 4, thank you for everything. Requiescat in pace.

This commit is obviously only beginning of bigger process. You can read more here: http://news.php.net/php.doc/969385115

git-svn-id: https://svn.php.net/repository/phpdoc/en/trunk@334580 c90b9560-bf6c-de11-be94-00142212c4b1